Exposure effect to cement dust pollution: a mini review
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The aim of this paper is to illuminate the impacts of cement production emissions on the environment. Various research work has shown that countries in sub-Saharan Africa, suffer the most from environmental pollution especially air pollution. One of such contributing factors is the behavioural pattern of workers and traders living close to production plants. Significantly also, data are not available in this region. The need for cement as well as the presence of local raw materials, coupled with the need for local content has resulted in an increase in the number of cement plants. Areas within and around the cement plant are exposed to various air pollutants. These pollutants affect the life and wellbeing of workers, children and people in close communities as well as the flora and fauna. Diseases such as chronic obstructive pulmonary, silicosis, preterm delivery, psychasthenia, endocrine disruption, cancer and infertility are associated with these pollutants. This paper describes the impacts of these pollutants on human’s health and plant’s growth as well as where studies should focus on in the future. Various high impact papers were selected and cogent findings as it affects different classes of people were discussed in this paper. It is recommended that more data collection, pollutant characterization, risk assessment and dispersion analysis should be carried out in developing countries. More research should be undertaken to determine the impact of alternative fuel and the effectiveness of dust control technologies used in various cement plants.
KeywordsCement plant Air pollution Environmental impact Cement plant exposure
1 Introduction global pollution and cement contribution
Data released by the World Health Organization (WHO) in 2018, showed that 9 in 10 people inhaled air that contains high levels of pollutants above the safe limit defined by the WHO. It has been established that globally, about 7 million people die annually from polluted air related issues. The impacts are critical in Asia and Africa, where 90% of the air pollution related deaths have been recorded. Pollution index obtained from Numbeo, showed that Asia has a high pollution index while only a few countries in Africa have enough data for these analyses. Countries in both regions where data are available showed pollution index from average to maximum. Regions with above average pollution index are Africa, South America and Asia. This is due to an increase in industrialisation and urbanisation, fuel sources and bush burning, little or reduced regulation and enforcement . The effects of this high pollution index across different regions were documented by WHO. Ischaemic heart disease is the highest recorded effect of pollution on human health as at the year 2018.
One major source of pollution is industrial processes and consequently, one of such industrial processes includes the cement production. A single cement plant emits a large amount of pollutants into the atmosphere. Furthermore, an increase in production output or change in fuel type and usage as well as dust control technology affects the volume and concentration of contaminant released. Several studies and reports have recognized cement production as the biggest source of PM emission accounting for 20–30% which is 40% of the total industrial emission [2, 3].
Global increase in urbanisation has led to an upsurge in cement demand . The need for local content, availability of raw materials and local demand has resulted in the establishment of more cement plants [5, 6, 7]. Globally, it was estimated that 2.18 billion tonnes of cement was produced in 2012  while 4.3 billion tonnes of cement were produced in 2014 . Several works and reports have credited China as the leading manufacturer of cement, accounting for 59.31% of the total cement produced worldwide [9, 10]. Corporate records from Nigeria have indicated that cement production increased from 28 million tonnes by 2013, to 30.75 million tonnes in recent years .
The most exploited topic relating to cement production is its greenhouse gas (GHG) emission, which accounts for about 5–7% of global anthropogenic Carbon dioxide (CO2) emission [12, 13, 14]. The contribution of this industry to CO2 production and proposed mitigation processes have been well detailed [15, 16, 17, 18]. The amount of CO2 emitted by the cement industry is based on the demand for cement, kiln type, fuel used, efficiency of energy utilization as well as clinker to cement ratio.
Different articles have reported that CO2 emission from cement plants is not the only pollutant discharged into the atmosphere. In China, 4% of SO2, 15–30% of PM and 10% of NOX released into the atmosphere annually were generated by the cement industry . In addition, 0.89, 1.69 and 3.58 million tonnes of SO2, NOX and PM were discharged in the atmosphere in China alone in 2009 . While in 2012, 1.09, 1.98 and 0.67 million tonnes of SO2, NOX and PM respectively were emitted in China alone . Different studies mentioned that for every 1380 Million tonnes of C02 emitted, 410, 1.3 and 2.27 million tonnes of PM, SO2 and NOX respectively were also released . Through raw materials and fuel used during production, 1.17–1.53 tons of mercury were emitted annually accounting for 10% the total mercury released globally [20, 21].
Dust emanates from different processes such as raw material handling, limestone crushing, kiln processing, clinker production and storage, finished cement grinding and power utilities [14, 23]. Different models and modelling tools such as fugitive dust model (FDM) and AERMOD View emission dispersion modelling, have been used to examine pollution effects on neighbouring communities . Modelling of air pollution or quality in developing countries such as Nigeria is limited . Effective and unbiased monitoring of air quality around factories such as cement manufacturing plants is carried out by a handful of researchers in developing countries. Complaints of people or perceived health implications had necessitated such studies.
Different studies reported that residents around cement plants complained about air pollution [25, 26, 27]. In most cases, the thick layer of dust on parked cars or on roadways as well as befouled atmosphere created chaos and public outcry among residents near the plant. In most cases, these residents are unaware of the dangers associated with cement dust in their environment. These residents are continuously exposed to different pollutants of which they lack a basic understanding. Various researchers have worked on the environmental impact of cement plants built within residential communities or residential communities built so close to cement plants. Their findings have not been limited to the effects on human beings but also included the effects on plants and in a few cases, on the aquatic environment.
In these communities, children are the most vulnerable . After which we have men and lastly females. There is a need to highlight various research works on the environmental impact of cement plant pollution. This paper will discuss the various types of pollutants, pollutant emission sources, effects on humans and plants.
3 Pollutants, sources and classification
Various research has shown that at different stages of cement production, there is release of dust [23, 29]. The nature and amount of the raw materials as well as the topography, and weather conditions affect the concentration of the dust and dispersal patterns. Also, extensive work has shown that this dust does affect the health of people living around the cement plant. Air quality of areas within and around the plant are always affected [30, 31, 32, 33, 34, 35].
Air pollutants from cement plants include PM, NOX, CO, SO2 and volatile organic compounds, O3, H2S, (PCDD/Fs) and (PCBs) [36, 37, 38, 39, 40, 41, 42]. CO and Hydrocarbons is from incomplete combustion [4, 43] while NOX is released during fuel combustion. SO2 is generated from raw materials used in cement production and from fuel sources [4, 14, 44]. The type of kiln used in a cement plant affects the amount of SO2 absorbed during production or emitted into the atmosphere . SO2 is oxided after emission to SO3, where it is either absorbed by moist in the atmosphere, to form sulfate aerosols or acidified on surface water and soil .
The PM released from cement plants range from 0.05 to 10 μm in diameter . Their particles sizes ranges from micrometre to nanometres [2, 46, 47, 48]. Different researchers have reported that the particle size plays a role on the effects that different PM sizes have. PM2.5 is reported to be responsible for a lot of human health issues than other PM sizes [49, 50]. PM sizes ranging from 10 to 2.5 μm are accumulated in the upper part of the respiratory system while smaller PM goes deeper into the lung system and the blood stream.
Apart from the sizes, PM contain several components such as mineral matter, sea spray, organic matter and elemental carbon, secondary inorganic aerosols, trace elements and unknown elements or compounds. Several heavy metals such as Arsenic (As), Cadmium (Cd), Chromium (Cr), Nickel (Ni), Zinc (Zn) and Lead (Pb) are among its trace element. Depending on exposure, concentration and individual sensitive, they can either be harmless or harmful . Their forms could vary from salts to oxides to gaseous form to complex particles, with their toxicity depending on their chemical speciation.
A typical PM consists of the components listed above but the composition varies depending on various factors such as PM size, seasonal variation, the raw material combination, fuel used and traffic condition or other industrial activity surrounding the plant. These variation affects the PM size, concentration and composition . The biggest problem about this characterization is the significant influence of traffic (vehicular emissions). To identify traffic influence, there is a need to take reading when only traffic PM can be recorded, and subtracted from PM reading when the cement plant influence is measured. But still, results will just be estimates as different conditions leading to PM emitted can vary on a day to day basis and even minutes basis. A comparison between when the cement is operational and not (work days and weekend) shows cement plants significantly influence trace element concentration. ‘Clean’ PM characterization has shown that certain trace elements can be traced to certain type of sources, such as Cobalt Co, Chromium (Cr), Manganese (Mn), and Antimony (Sb) to traffic, and Aluminum (Al), Calcuim (Ca), Nickel (Ni) and Vanadium (V) to cement plant. There variation or constant variation helps to estimate various effects . Particle size distribution of the raw materials shows the primary source of this PM. Raw materials such as fly ash, coal + coke have large portion of particulates ranging from PM0.1 to PM10. The elemental compositions of the particles are dependent on the raw materials as well as the alternative fuel used.
Input rates of heavy metals and emission through dust control system observed by 
As (kg h−1)
Cd (kg h−1)
Cr (kg h−1)
Cu (kg h−1)
Ni (kg h−1)
Pb (kg h−1)
Zn (kg h−1)
Mlakar et al. , estimated that at a particular cement plant in western part of Slovenia, injected 27 kg of mercury into its system during a production year through mostly the raw material (16.1 kg/yr), and fuel accounting for 10.9 kg/yr in 2006. As the production capacity is increased or more plants are built, the use of more raw materials and coal as fuel would increase the amount emitted each year. This trend has being observed in China, as an increase in production has led to an increase in the amount of mercury emitted . The utilization of various materials during production such as sludge at percentages higher the 15% affects the composition of the PM . The use of materials such as waste oil, sewage sludge, tyre and refuse derived fuel could increase the level of heavy metals released to the atmosphere. Naturally, the raw materials used in production of cement process different levels of various elements, but the addition of alternative fuel significantly increased the amount.
The use of tyre as supplementary fuel has resulted in the release of class I and II metals. Such metal recorded include N, Pb, Zn. However, several studies have documented scenarios where the emission of heavy metals with alternative fuels has no significant impact. In such scenarios, the fuel replacement ratio, waste preparation, reducing or oxidising atmosphere and feeding point, is pivot. Some scenarios have favoured some metal compared to other metals. Different alternative fuels have different mix ratio with traditional fuel, in most cases the composition of the alternative raw material will determine its application and transfer factor . However, although the input of metal elements are increased though this alternative fuel source (as shown in Table 2), the consensus remains that the increase are still not significant . With a good mix ratio achieved on a plant to plant basis, depending on the type of fuel waste available within the plant environ, the use of alternative fuel leads to reduction in pollutant emission and natural resources as well as cost reduction in addition to substantiality .
Heavy metal present in alternative fuel sources
Heavy metal classification
From a comparative assessment, higher amounts of Cu, Mn, Cr and Ni were reported in the US than in Nigeria . The concentration of Ni measured in US was higher than the average published value and was twice the value obtained in Nigeria. Also, Cu, Mn and Cr were 10, 7 and 13.4 times higher than Nigeria cement dust. But the Cadmium concentration in Nigeria cement dust is between 9.8 and 11 times the US cement dust while Hg and Pb were also higher in Nigeria cement dust. Other metals include Ca, Zn and Fe.
Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), also referred to as dioxins are a group of 210 chlorinated organic compounds . According to several reports such as , only seventeen PCDD/Fs congeners with chlorine substitution in 2, 3, 7, 8 positions are harmful to humans. Reports especially historical inventory such as  put cement plants release of PCDD/Fs to about 10.3% of total emissions. The formations of PCDD/Fs are dependent on kiln type, feeding fuel, raw material, air pollution control devices and combustion conditions. Multiple researchers have shown that PCDD/F emissions from alternative fuels are not higher than using conventional fuel .
4 Effects on human
Year of publication
Type of study or design and population (sample size or type)
City or country
Health effects observed
Method for outcome detection
Complaints or health problems expressed by (% or ORs or RR)
Cross-section (non-factory worker, adults only)
Exposed: residence < 2 km from cement plant (5042 subjects)
Unexposed: residence > 2 km (80,976 subjects)
Non-carcinogenic and carcinogenic
Quantitative methodology/deterministic analysis
Number of subjects developing cancer in their lifetime: mean conc, 0.19a and maximum conc 0.03b
Retrospective cohort (all male)
Exposure: factor workers (10,742 subjects)
Cancer mortality and Incidence
Cancer Registry/National Death Registry
SMR for All cancer
Quarry: SMR = 1.02 (0.57–1.68)
Production: SMR = 0.76 (0.56–1.06)
Maintenance: SMR = 0.84 (0.48–1.37)
Laboratory: SMR = 1.03 (0.33–2.39)
Office: SMR = 0.79 (0.51–1.15)
All subject: SMR = 0.83 (0.68–1.01)
SIR for all cancer
Quarry: SIR = 1.00 (0.60–1.56)
Production: SIR = 0.93 (0.72–1.18)
Maintenance: SIR = 1.06 (0.70–1.55)
Laboratory: SIR = 1.21 (0.52–2.38)
Office: SIR = 1.09 (0.82–1.42)
All subject: SIR = 1.01 (0.87–1.18)
Retrospective cohort study
Exposure: factory worker with more than 5 years exposure (64 subjects)
Unexposure: non-factory worker living more than 5 km (64 subjects)
Stuffy nose/epistaxis, lower respiratory problems, GI problems, oral problems, musculoskeletal problems
Pervalence (exposed vs. unexposed): stuffy nose/epistaxis: 45.3% versus 3.1%
Lower respiratory problems: 37.5% versus 3.1%
GI problems: 21.8% versus 3.1%
Oral problems: 37.5% versus 4.6%
Musculoskeletal problems: 18.8% versus 4.6%
Retrospective cohort study
Exposure: factor workers [43,490 subjects (29,288 males and 14,202 female)]
Mortality, malignant neoplasms
Cancer Registry/Death Registry
Male SMR (95% CI), female SMR (95% CI)
All causes: SMR = 1.0, (0.9–1.1), SMR = 0.8, (0.6–1.0)
Male SIR = (95% CI), female SIR = (95% CI)
All malignant neoplasms: male SIR = 1.2 (1.0–1.4), female SIR = 0.8 (0.6–1.1)
Rectum: male SIR = 1.4(0.6 – 2.8), female SIR = 0.9 (0.2–3.7).
Lung: male SIR = 1.5 (1.1–2.1), female SIR = 1.7 (0.6–5.4)
Urinary bladder: male SIR = 1.8 (0.9–3.5), female SIR = 1.9 (0.3–13.4)
Mazzano and Rezzato, Italy
Exposure: three groups of residences exposed to between 81 to 150 ug/m3 (children: (1372 total, 274 cases and 1098 controls, adult: (6248 total, 2182 cases and 4066 controls)
Hospital admissions for respiratory or cardiovascular causes
E1 versus E0: OR = 1.676 (1.079–2.602)
E2 versus E0: OR = 1.90 (1.20–3.04)
Respiratory causes + cardiovascular causes: E1 versus E0: OR = 1.30 (1.10–1.52)
E2 versus E0: OR = 1.16 (0.97–1.39)
Exposed: residence < 2 km from cement plant (3067 subjects)
Unexposed: residence 2–4 km from cement plant (14,049 subjects)
Routine registration of births
OR = 1.30 (1.09–1.54)
Adjusted for maternal age, season, marital status, maternal education and infant sex
Exposed: home address < 2–5 km from cement industries
Ovarian cancer mortality
RRs (95% credible interval)
2 km RR = 0.83 (0.64–1.05)
3 km RR = 0.90 (0.78–1.02)
4 km RR = 0.90 (0.82–1.00)
5 km RR = 0.95 (0.86–1.04)
RRs adjusted for population size, percentage of illiteracy, farmers and unemployed persons, average persons per household, and mean income
Exposed: residence ≤ 5 km from cement industries
Unexposed: general population living in Spain
All cancers: SMR ¼ 1.04 (1.01e1.07)
Colorectal cancer: SMR ¼ 1.09 (1.03e1.15)
Peritoneal cancer (only for men): SMR ¼ 1.61 (1.12e2.24)
Pleural cancer: SMR ¼ 1.59 (1.19e2.06)
Bladder cancer: SMR ¼ 1.11 (1.02e1.20)
Adjusted for population size, percentages of illiteracy, farmers and unemployed persons, average persons per household, and mean income
Case-control [children (0–14 years)]
Exposed: cement and lime industries at < 2.5 km (114 cases)
Unexposed: residence > 3 km from any industries and far from urban areas (684 subjects)
Malignant bone tumors
Spanish Registry of Childhood Tumors, Birth Registry of the Spanish National Statistics Institute
OR = 3.89 (1.19–12.77) at 2.5 km
Adjusted for age, sex, region of residence
Exposed: residence ≤ 5 km from cement industries
Unexposed: general population living in Spain
Breast and prostate cancer mortality
RRs (95% credible interval)
2 km RR = 0.91 (0.78–1.05)
RRs (95% credible interval)
2 km RR = 0.95 (0.82–1.10)
RRs adjusted for population size, percentage of illiteracy, farmers and unemployed persons, average persons per household, and mean income
Several reports have concluded that PCDD/F emissions do not pose a significant threat to humans health . This does not mean it cannot be, but generally, its emission is within limits. The possible effects on humans health include endocrine disruption, and carcinogenicity . The inhalation cancer risk was revealed to be between 5.0 × 10−11 and 2.0 × 10−8 while that of oral carcinogenic risk is between 1.8 × 10−8 and 7.6 × 10−8 . The incremental lifetime risk of cancer for people living close to a plant will be 0.03. Silica dust causes silicosis and fatal lung diseases. The presence of chromium compounds in cement dust might lead to cancer .
Several researchers have argued that pollutants might have unknown consequences on the people and the environment . Their reaction within the human body could be novel. With various sizes, absorption into the body might be unpreventable.
Research has also shown that cement dust causes morbidity, chronic obstructive pulmonary, preterm delivery, psychasthenia, endocrine disruption, and infertility. The severity is dependent on the duration of exposure, concentration and element constituent of the dust, and individual sensitivity [70, 71, 72, 73, 74].
The first victims are usually the factory workers. Several studies revealed that factory workers suffered from respiratory diseases, and it is more prevalent among the packing section workers . Dermatitis, caused by hexavalent chromium (Cr6+) in cement are observed within the workforce . High level of Cd observed in the Nigeria cement dust, constitute a high health risk as its average half-life in a human body is between 4 and 19 years . Long-term exposure might lead to renal tubular dysfunction. It also affects the respiratory tract and immune system modulation and reduces the phagocytic activity of polymorphonuclear neutrophils (PMN).
Several research works, including Emmanuel and Alabi , indicating a higher risk of chronic kidney disease and end-stage renal disease. This research reported showed that cement factory workers have a higher white blood cell (WBC) and lower red blood cell. This is suggested to be due to the response of the body to irritation on the body. Also, it might be due to increase in Lymphocytes count and reduction in monocytes count. The increase in platelets was observed to be due to stress response. Other research reported that cement dust results in a reduction of haemoglobin concentration as well as packed cell volume, which might indicate anaemic condition . Diverse researchers linked the increase in WBC and RBC to a harmful effect on bone marrow.
Different studies such as Oyinloye , Yang et al.  and Smailyte et al. , have used different methods to determine the relative risk or standardised incidence ratios (SIR) of worker to different risks workers are exposed to. However, qualitative analysis was not carried out to understand whether or not the risks calculated is mainly based on cement plant emission or due to addition of other factors such as traffic or other industries in the area.
Different research has indicated that the lung cancer relative risk associated with PM exposure ranges from 3.36 to 0.91 from different variables considered. The study also showed DNA damages, micronuclei sister chromatid exchange, swingle-strand breaks and oxidative DNA damage. Toxicological studies in vivo and in vitro showed that PM have the ability to generate continuously high reactive oxygen species (ROS), which aids the genotoxic and cytotoxic mechanisms of PM .
Ogunbileje et al. [7, 34] indicated that the primary effect of Hg is its accumulation in the kidney and its disruption of activities within the liver. Hg’s long term effects include debilitating diseases which include neurodegeneration (Alzheimer’s disease and Autism). Continuous exposure of workers to Mn results in lung irritation and lung injury. This is observed as cough, pneumonitis, and bronchitis, which is easily associated with cement factory workers.
Oguntoke et al. , reported that 31% of the examined workers reported dermatitis, rashes and eczema. These complaints were followed by catarrh, cold and coughs. The engineers reported dermatitis and eczema more. Production workers and quarry workers reported respiratory tract infection . Also, conjunctivitis and furunculosis were reported by production workers.
A study by Bertoldi et al.  discovered that children (also by Marcon et al. ) were more negatively affected by cement plant air pollution. It was discovered that if the concentration of NOX is lower than 110 μg/m3, the child hospital admission rate would be reduced by 38%. The second group affected mostly, were male groups as more men were observed to work in the open. But Adeniran et al.  and Yang et al.  revealed that dust measured from houses at some distance from a cement plant was well beyond the WHO standard.
Research has not specifically linked certain diseases with cement dust or air pollutant from cement plants. Researchers are observing an increase in risk when living near cement plants. García-pérez et al. , associated risk increase of ovarian cancer mortality with living close to cement plants. García-pérez et al. , linked living near a cement plant to increase in the chance of colon-rectum cancer for both men and women. Also, higher risk for having gallbladder, peritoneum, pleura and bladder cancer were noticed. It observed that men are the most affected mainly due to their occupation.
The link between bone tumours in children and living near industries such as cement plant was observed by [66, 76]. García-Pérez et al. , observed people living near a cement plant would have higher risks of breast and prostate cancer mortality. Yang et al. , indicated that cement dust might contribute to preterm delivery, but there are other factors to consider. Also, Marcon et al. , observed that children’s exposure to PM causes acute adverse health effects, with more effects on the long term.
5 Effects on plant and aquatic life
Studies examined for plant effects
Year of publication
Type of sample and size
City or country
Method used for analysis
Aquatic plants (3 species) (Lemna minor, Ceratophyllum submersum and Potamogeton natans)
Reduced diversity and number of aquatic plant species
Examination of enzyme activities such as catalase (CAT), peroxidase (POX), superoxide dismutase (SOD)
36 plant species
3 out of the 36 species (Artemisia spicigera, Crambe orientalis, and Convolvulus sepium) are more suitable for cement dust polluted areas
Examination of enzyme activities such as POX and SOD
5 Species (Crataegus aronia, Gundelia tournefortii, Anchusa strigosa, Lactuca orientalis and Astragalus bethlehmiticus) and Crataegus aronia as control
Loss of diversity of endemic species and calcium concentration was observed to be high
Scanning electron microscope (SEM) micrographs and The X-ray microanalysis illustrated
5 species were selected i.e. Madhuca indica, Ficus religeosa, Azadirechta indica, Eucalyptus globulus and Mangifera indica
Madhya Pradesh, India
Eucalyptus globulus and Madhuca indica are the least affected plants by chlorosis and necrosis
Estimation of necrosis/chlorosis on plant leaves and dust load estimation
8 wild plants (Medigago varia, Anchusa leptophylla, Euphorbia orientalis, Lactuca serriola, Artemisia spicigera, Crambe orientalis, Convolvulus sepium and Senecio vernalis)
Levels of phosphorus P, sulfur S, potassium K and chlorine Cl to be high, that of calcium Ca and iron Fe were low in plants growing in the factory area of 0–100 m
Analysis using wavelength-dispersive spectrometer and X-ray fluorescence technique
All organisms’ need certain elements in certain proportions, large doses are mostly detrimental. Negative effects observed include oxidative stress, damage of cell membranes, photosynthetic apparatus and photosystem, excessive production of reactive compounds, protein cleavage as well as chlorophyll biosynthesis. Cells have developed different mechanisms such as the enzymatic and non-enzymatic mechanism to cope with the various effects. They include catalase (CAT), peroxidase (POX) and superoxide dismutase (SOD) [37, 79]. The activity of CAT, SOD, and POX as varied with different plants, especially when close to the pollution source.
Erdal and Demirtas  revealed that H2O2 levels were higher in plants within the polluted area. Malondialdehyde (MDA) was observed to increase as H2O2 increased. This is attributed to cell damage. Kumar et al.  reported that lives around the cement plant suffer chlorosis and necrosis. Also, Salih et al.  revealed that the levels of P (phosphorus), K (potassium), S (sulfur), and Cl (chlorine) have been reported to be high around factories while Ca (Calcium) and Fe (Iron) elements reduced. This result in stunted growth, leaf resetting, chlorosis, brown-gray necrosis, reduced long term yield. All these elements are required in the plant at acceptable levels, but the constant emission of these elements affects the ability of the plant to internally process and survive on these elements. Basically, plants require 0.1–0.5% S, 0.3–0.5% P and 2–5% K of the plant dry weight. They also require 0.20–0.40 mg/g of Cl dry weight and 100 ppm Fe of dry matter. Excess or reduction of these elements amounts on plant significantly affects the growth and survival of the plant.
Oran and Zahra  observed that cement dust affects local plant species and diversity. Effects of cement dust were observed in beaches in which it was preventing the egg hatching of sea turtles . It discovered that it prevented oxygen and carbon dioxide diffusion.
Alternative fuel sources contribute to air pollution, but the effect and risk associated with its pollutant do not increase diseases among residential areas near the plant . The developments of energy efficiency and CO2 emission reduction models and scenarios have shown that the number of air pollutant would reduce. Zhang et al. and Zhang et al. [14, 83], and project that PM, SO2, and NOX would be reduced by 2–5%, 10–25% and 8–20% by the year 2030. In most cases, only one or two elements are above specified standards [2, 40].
6 Studies needed in developing regions
The pollution of the cement industry has never been denied, but the extent to which it affects the environment is still unknown. The effects of cement kiln dust from different cement plant on human health or the environment vary based on individual plant characteristics and operation processes. The presence of other industries or even traffic significantly affects the estimation of the effects of these pollutants on human health. In most studies where a particular contaminant is high, it is an individual plant problem.
Therefore, studies of various cement plants at different location across all regions should be carried out locally, since each cement emission is specific. Raw materials used in production in developing countries should be investigated to understand their contribution to pollutant generation and the amount emitted through the production process. Also, there is a need to create real time air quality stations near a cement plant, especially in developing countries where little or no data is available.
Most studies from Africa failed to mention the alternative fuel used as well as the dust control technology in place, its efficiency and its effects on the characteristics of emitted pollutants. Also, the concentration of pollutant released into the atmosphere was not effectively measured or examined. Dispersion modelling is not being carried out to understand the effects of different pollutants have on people living close to the plant. However, some studies from Africa have shed light on the concentration of heavy metals present in cement kiln dust.
More studies into the impact of cement dust needs to be carried out in developing counties. Present studies from developing countries focus more on occupational studies. Those studies are achieved through interviews of what sickness workers regularly experience. In most cases, the numbers of subjects are small, and are biased. More studies using ecologic, retrospective cohort study or case-control study design needs to be carried out.
Since bush or wood burning contributes largely to PM generation in Africa, research into the characterisation of such PM from these activities should be carried out. The results of such analysis should be compared with the PM characteristics from cement plants.
Cement production pollutants cannot be ultimately held responsible for cancer cases. There is more than enough evidence to associate it with respiratory diseases, skin and eye irritation. There are so many factors to consider, and the role of cement pollution is still unknown. The extent to which it contributes will be more obvious as more researches are done in this regard. Retired or long servicing workers should be examined for various health implications under retrospective cohort study. Their continuous exposure over the years makes them valuable subjects.
Until the connection is made and appropriate amendments carried out, standard air pollution control measures must be enforced. Some plants where air quality monitoring is low have recorded more environmental effects. Recent improvements in the invention and production processes have resulted in the reduction of pollutant emission to the atmosphere. The reduction method might be finding an alternative to cement as a product. The amount of pollutants released even with the best methods is dependent on the amount of cement produced.
It is recommended that more routine air quality assessments carried out by different stakeholders. More research ecologic and Retrospective cohort study to understand effects of cement exposure needs to be done. Adherence to international standards on dust control technologies must be encouraged and monitored. The best method for workers is the use of protective personal equipment, which is not sometimes used by them even when freely provided. For resident, the best option is living more than 5 km away from the plant.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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