Abstract
The study was undertaken to examine the nature of particulate chalk dust settled on classroom floor during traditional teaching with dusting and non-dusting chalks on two types of boards viz. rough and smooth. Settling chalk particles were collected for 30 min during teaching in glass Petri plates placed in classrooms within 3 m distance from the teaching boards. Particle size distribution, scanning electron microscopic images of chalk dusts and compressive strength of two types of chalks were tested and evaluated. Results showed that a larger proportion of dusts generated from anti-dusting chalks were of <4.5 and <2.5 μm size on both smooth and rough boards, as compared to dusting chalks. Non-dusting chalks, on an average, produced about 56% and 62% (by volume) of <4.5 μm (respirable) diameter, on rough and smooth boards, respectively, while the corresponding values for dusting chalks were 36% and 45%. Also, on an average, 83% and 94% (by volume) of the particles were <11 μm (thoracic) in case of non-dusting chalks against 61% and 72% for dusting chalks on rough and smooth boards, respectively. Interestingly, taking into account the mass of chalk dust produced per unit time, which was higher in dusting chalks than non dusting chalks, the former was actually producing higher amount of PM <4.5 and <11 particles from both types of boards. Scanning electron microscope images revealed that chalk particles had random shape, although in dusting chalks prevalence of elongated particles was observed, apparently due to the longitudinal breaking of the chalks during writing, which was confirmed during compressive strength testing. We could conclude that dusting chalks could be potentially more harmful than anti dusting chalks, as they produced higher amount of potentially dangerous PM 4.5 and PM 11.
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References
Berne, R. M., & Levy, M. N. (1998). Physiology. St. Louis, MO: Mosby.
Costa, D. L., & Schelegle, E. S. (1999). Irritant air pollutants. In D. L. Swift, & W. M. Foster (Eds.) Air pollutants and the respiratory tract (pp. 119–145). New York: Marcel Dekker.
Debray, P., Misra, J., & Ghosh, C. (2002). Peak expiratory flow rate and cardio respiratory fitness of Bengali workers exposed to dust and plant source particulate matter. Indian Journal of Community Medicine, 26(4), 171–174.
Delfino, R. J., Zeiger, R. S., Seltzer, J. M., & Street, D. H. (1998). Symptoms in pediatric asthmatics and air pollution: differences in effects by symptom severity, anti-inflammatory medication use and particulate averaging time. Environmental Health Perspectives, 106, 751–761.
Gamble, J. F. (1998). PM 2.5 and mortality in long term prospective cohort studies: Cause effect or statistical association? Environmental Health Perspectives, 106(9), 535–549.
Heinke, G. W. (1996). Microbiology and epidemiology. In J. G. Henry, & G. W. Heinke (Eds.) Environmental science and engineering (pp. 254–302). New Jersey, USA: Prentice Hall.
Kent, E. P., Green, F. H. Y., Saiki, C., Vallyathan, V., Plopper, C. G., Gopal, V., et al. (2000). Distribution of particulate matter tissue and tissue remodeling in the human lung. Environmental Health Perspectives, 108(11), 1063–1069.
Lewis, E. P., Robins, T. G., Dvonch, J. T., Keeler, G. J., Yip, F. Y., Mentz, B. G., et al. (2005). Air pollution associated changes in lung function among asthmatic children in Detroit. Environmental Health Perspectives, 113(8), 1068–1075.
McConnell, R., Berhane, K., Gilliland, F., Molitor, J., Thomas, D., & Lurmann, F. (2003). Prospective study of air pollution and bronchitic symptoms in children with asthma. American Journal of Respiratory and Critical Care Medicine, 168(7), 790–797.
Moroz, W. J. (1996). Air pollution. In J. G. Henry, & G. W. Heinke (Eds.) Environmental science and engineering (pp. 492–566). New Jersey, USA: Prentice Hall.
Norris, G., Young Pong, S. N., Koenig, J. Q., Larson, T. V., Sheppard, L., & Stout, J. W. (1999). An association between fine particles and asthma emergency department visits for children in Seattle. Environmental Health Perspectives, 107, 489–493.
Raabe, O. G. (1999). Respiratory exposure to air pollutants. In D. L. Swift, & W. M. Foster (Eds.) Air pollutants and the respiratory tract (pp. 39–73). New York: Marcel Dekker.
Thibodeau, G. A., & Patton, K. T. (1996). Anatomy and physiology. St. Louis, MO: Mosby.
van der Zee, S., Hoek, G., Boezen, H. M., Schouten, J. P., van Wijnen, J. H., & Brunekreef, B. (1999). Acute effects of urban air pollution on respiratory health of children with and without chronic respiratory symptoms. Occupational and Environmental Medicine, 56(12), 802–812.
Yu, O., Sheppard, L., Lumley, T., Koenig, J. Q., & Shapiro, G. G. (2000). Effects of ambient air pollution on symptoms of asthma in Seattle area children enrolled in the CAMP study. Environmental Health Perspectives, 108, 1209–1214.
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Majumdar, D., William, S.P.M.P. Chalk dustfall during classroom teaching: particle size distribution and morphological characteristics. Environ Monit Assess 148, 343–351 (2009). https://doi.org/10.1007/s10661-008-0164-2
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DOI: https://doi.org/10.1007/s10661-008-0164-2