However, SAFAR experts say that stubble burning may not be major contributor for PM1, as the burning events saw a peak in PM10 and PM2.5, but no change in PM1 concentration.
The study found that during the period, 83 percent of PM2.5 was made up of PM1.
The current international standards for PM2.5 is 60 units and for PM10 it is 100 units.
Committee decided that there are not enough hard evidences of its dangers, though we know it is hazardous," he added.
"There must be other sources of PM1, beside automobile.
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