DC Jakhwal, scientist at the Air Laboratory, CPCB, had previously told dna that even though collecting exact data on the exact number of cars currently plying in Delhi – their engine quality, fuel grade, degree of usage – is a massive logistical exercise with a number of variables, automobiles do cause the maximum amount of pollution in the air. Delhi does not have the scale of industry that could compete with vehicular pollution to deflect blame.Meanwhile, Anand Vihar, with the dubious honour of one of the most polluted places in the country registered a Pm2.5 reading of 313.92, exceeding the prescribed standard by 213.92, and RK Puram saw PM2.5 concentration of 296.51 and a PM10 concentration of 422.62.PM2.5 and PM10, two measure of particulate matter, have been Delhi’s most prominent pollutants, and accurate readings for these are important to measure how Delhi’s air quality has worsened over the years and take concrete action, according to Jakhwal. The CPCB would soon move to measuring PM1, he added.

dna Correspondent

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Delhi’s air quality index shoots up hours before odd even is implemented