INSUBCONTINENT EXCLUSIVE:
less than one micron, as compared to other cities where its being measured, data from government agency showed.According to the data
procured by news agency IANS from System of Air Quality and Weather Forecasting And Research or SAFAR in Delhi, 47 percent of PM2.5 was
concentration was also highest during November 2017 "smog-episode" in Delhi, during which its average concentration was around 130 units
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,
Its a matter of investigation," Mr Beig said, pointing out that there are at least 26 different sources of emission leading to air pollution
in urban regions.PM2.5 (or particles with diameter less than 2.5 micron) is the major pollutant in Delhi
Few studies had been done on PM1 globally and agencies are yet to mark safety standards for it.However, a recent study published by
characterisation and quantitative assessment of source-specific health risk of trace elements in PM1 at a road site of Delhi, India",
collected samples in Delhi from November 2009 to March 2010
The study found that during the period, 83 percent of PM2.5 was made up of PM1."The PM1 are mainly emitted from combustion sources," says
the IIT study, pointing out that the increased number of private vehicles in the city increased from 3.3 million in 2000 to 7.4 million in
The study also pointed out that chemical composition of the fine aerosol particles pose adverse effects on human health, especially in urban
implementation of the Bharat Standard-VI (Euro-VI equivalent) compliant cleaner transport fuels across the nation by April 2020, experts
Delhi in 2017 saw an average concentration of PM1 at 79 units (PM2.5 169 units) in winters, 33 units (PM2.5 75 units) in summers and 31
units (PM2.5 51 units) during monsoon
The units for particle pollutant is microgrammes per cubic meters.Meanwhile, in the same period, the average concentration of PM1 in Mumbai
was 38 units in winters (46 percent of PM2.5), 31 units in summers (46 percent of PM2.5) and 17 units during monsoon (50 percent of PM2.5)
Ahmedabad in Gujarat, has the most moderate PM1 average concentration of all three cities, with 35 units in winters, 31 in summers and 16
the particles, more deep they penetrate into the human lungs.Mr Beig, who is member of the World Health Organisation or WHO committee that
fixes the health guidelines for hazardous pollutant, said that the issue has already been raised before the organisation."In last meeting in
2016, we raised the issue of PM1
Committee decided that there are not enough hard evidences of its dangers, though we know it is hazardous," he added
