Abstract:

The present study is focused on relationship of school community personal exposure of PM5 with indoor and ambient-outdoor PM5 in Bhilai, District Durg, India. A representative longitudinal study design has been adopted. School community is divided in two categories: 1. Subjects of science discipline, 2. Subjects of non-science discipline. Each category was again sub-divided in two classes: A. Teachers and B. students. On the basis of local meteorological parameters and school building constructions, three schools have been identified for the study. Five subjects have been selected in each sub-class and monitored for 24-hour integrated personal PM5 in a 48 hrs sampling session using personal samplers. Five sampling sessions has been carriedout for each participant. PM5 levels of school indoors, respective ambient-outdoors has also been monitored throughout the sampling year in each selected school micro-environment. Paired samples of ambient PM10 and PM5 were also collected to investigate relationship with Indian NAAQS for PM10. Regressions between school indoors and ambient-outdoor PM5 have shown strong positive relationships in case of two schools having moderate ventilation. All school indoors PM5 levels have shown higher concentration compared to their respective ambient-outdoor levels. PM5/PM10 ratios have been found in the range of 0.32-0.62 and exceed the NAAQS standards of 60 µg.M-3. Personal PM5 levels of category 1 have shown strong correlation with school indoors compared to ambient outdoors. All personal PM5 levels have shown higher values compared to NAQQS standards. Source apportionment of personal PM5 is carriedout for representative participants of each school. Ambient-outdoor, indoors, soils and road-traffic dusts PM5 compositional profile was used as source profile inputs for CMB 8. Results showed that ambient–outdoor is dominating contributor of personal PM5 in school located near heavy industrial area while other schools have shown indoor and rod-dust sources as more dominating contributors in personal PM5.

Presentation: http://www.cleanairnet.org/baq2006/1757/docs/SW9_1.ppt