Delhi Has Double Concentration Of Finer, More Dangerous Pollutant PM1

  • By NDTV
  • | Monday | 16th April, 2018

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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Delhi has almost twice the concentration of the more lethal pollutant PM1, or particles with diameter 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 composed of PM1 during winters, 44 percent during summers and 61 percent during monsoon, in 2017.Saying that though more study is required on the subject, Gufran Beig, Project Director SAFAR finds automobile combustion to be one of the major contributor of PM1 in Delhi.PM1 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, but no change in PM1 concentration."There must be other sources of PM1, beside automobile.

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 IIT-Delhi and IIT-Kanpur, finds that higher PM1 concentration on the roadside of Delhi increases risk of lung cancer.The study, "Chemical 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.


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