An air quality sampling program was designed and implemented to collect the baseline concentrations of respirable suspended
particulates (RSP = PM
10), non-respirable suspended particulates (NRSP) and fine suspended particulates (FSP = PM
2.5). Over a three-week period, a 24-h average concentrations were calculated from the samples collected at an industrial site
in Southern Delhi and compared to datasets collected in Satna by Envirotech Limited, Okhla, Delhi in order to establish the
characteristic difference in emission patterns. PM
2.5, PM
10, and total suspended particulates (TSP) concentrations at Satna were 20.5 ± 6.0, 102.1 ± 41.1, and 387.6 ± 222.4 μg m
−3 and at Delhi were 126.7 ± 28.6, 268.6 ± 39.1, and 687.7 ± 117.4 μg m
−3. Values at Delhi were well above the standard limit for 24-h PM
2.5 United States National Ambient Air Quality Standards (USNAAQS; 65 μg m
−3), while values at Satna were under the standard limit. Results were compared with various worldwide studies. These comparisons
suggest an immediate need for the promulgation of new PM
2.5 standards. The position of PM
10 in Delhi is drastic and needs an immediate attention. PM
10 levels at Delhi were also well above the standard limit for 24-h PM
10 National Ambient Air Quality Standards (NAAQS; 150 μg m
−3), while levels at Satna remained under the standard limit. PM
2.5/PM
10 values were also calculated to determine PM
2.5 contribution. At Satna, PM
2.5 contribution to PM
10 was only 20% compared to 47% in Delhi. TSP values at Delhi were well above, while TSP values at Satna were under, the standard
limit for 24-h TSP NAAQS (500 μg m
−3). At Satna, the PM
10 contribution to TSP was only 26% compared to 39% in Delhi. The correlation between PM
10, PM
2.5, and TSP were also calculated in order to gain an insight to their sources. Both in Satna and in Delhi, none of the sources
was dominant a varied pattern of emissions was obtained, showing the presence of heterogeneous emission density and that nonrespirable
suspended particulate (NRSP) formed the greatest part of the particulate load.
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