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Impact of fine particulate fluctuation and other variables on Beijing’s air quality index

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Abstract

We analyzed fluctuation in Beijing’s air quality over 328 days, based on air quality grades and air quality data from 35 atmospheric monitoring stations. Our results show the air over Beijing is subject to pollution 152 days of the year, or 46.34 %. Among all pollutants, fine particulates, solid or liquid, 2.5 μm or less in size (PM2.5), appeared most frequently as the primary pollutant: 249 days, or 76 % of the sample year (328 days). Nitrogen dioxide (NO2) and coarse particulates (PM10) cause the least pollution, appearing only 7 and 3 days, or 2 and 1 % of the sample year, respectively. In Beijing, fine particulates like PM2.5 vary seasonally: 154.54 ± 18.60 in winter > 145.22 ± 18.61 in spring > 140.16 ± 20.76 in autumn > 122.37 ± 13.42 in summer. Air quality is best in August and worst in December, while various districts in Beijing experience different air quality. To be specific, from south to north and from west to east, air quality tends to improve. Meteorological elements have a constraining effect on air pollutants, which means there is a linear correlation between the air quality index and humidity, rainfall, wind speed, and temperature. Under a typical pollution scenario, the higher the air quality index (AQI) value, the lower the wind speed and the greater the relative humidity; the lower the AQI value, the higher the wind speed and lower the relative humidity. Analysis of influencing factors reveals that the air pollution is mainly particulate matter produced by burning coal, vehicle emissions, volatile oils and gas, fast development of food services, emissions from the surrounding region, and natural dust clouds formed in arid areas to the northwest. Topography affects the distribution of meteorological conditions, in turn varying air quality over the region from one location to another. Human activities also exercise impact on urban air quality with dual functions.

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Acknowledgements

This work is financially supported by the Special Fund for Forestry Scientific Research in the Public Interest (No. 20130430101) and the CFERN&GENE Award Funds for Ecological Papers.

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Authors and Affiliations

  1. Forestry and Pomology Institute, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100093, China

    Bo Chen, Shaowei Lu & Shaoning Li

  2. Institute of Forest Ecology and Environmental Protection, Chinese Academy of Forestry, Beijing, 100091, China

    Bing Wang

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  1. Bo Chen
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  2. Shaowei Lu
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  3. Shaoning Li
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  4. Bing Wang
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Correspondence to Shaoning Li or Bing Wang.

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Responsible editor: Gerhard Lammel

Bo Chen and Shaowei Lu are co-first Author.

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Chen, B., Lu, S., Li, S. et al. Impact of fine particulate fluctuation and other variables on Beijing’s air quality index. Environ Sci Pollut Res 22, 5139–5151 (2015). https://doi.org/10.1007/s11356-014-4024-z

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  • DOI: https://doi.org/10.1007/s11356-014-4024-z

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