Inderscience Publishers

Winter time particulate matter concentrations at an urban roadway in India

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This paper presents analysis and interpretation of 1-hr average fine (PM
1
and PM
2.5
) and coarse (PM
10
) particulate matter (PM) concentrations measured during winter 2008 and 2009 at a roadside in Chennai city, India. Results showed typical weekly and diurnal cycles with high concentrations corresponding morning and evening peak traffic flows. The 24-hr average PM
10
and PM
2.5
concentrations were found to be 135 ± 65 and 73 ± 39 μg/m
3
in winter 2008 and 131 ± 75 and 67 ± 32 μg/m
3
in winter 2009, respectively and were violating the NAAQS (PM
10
= 100 μg/m
3
; PM
2.5
= 60 μg/m
3
) and WHO (PM
10
= 50 μg/m
3
; PM
2.5
= 25 μg/m
3
) limits. The daily PM
1
concentrations at the study site were in the range of 11–200 (mean = 56) μg/m
3
. The estimated mortality relative risks associated with daily PM concentrations showed a high (81–85%) and moderate (42–48%) relative risks for PM
10
and PM
2.5
, respectively, at the study site.

Keywords: air quality standards, particulate matter, PM, PM 10, PM 2.5, PM 1, health effects, meteorology, inversion conditions, traffic flow, mortality relative risks, India

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