The PM10 recordings ranged from 52 microgram/cubic metre to 111 microgram/cubic metre during Deepavali as against the prescribed standard of 100 microgram/cubic metre. Likewise, the PM2.5 levels ranged from 32 microgram/cubic metre to 59 microgram/cubic metre, the permissible limit being 60 microgram/cubic metre for 24 hours, the TNPCB said. It attributed the reduction in pollution levels to the directives of the Supreme Court and the National Green Tribunal and its own efforts to create awareness. Maximum levels touched 500 microgram/cubic metre in Arumbakkam around 9 p.m. At Manali, the highs were around 300 microgram/cubic metre around the same time. Maximum levels touched 500 microgram/cubic metre in Arumbakkam around 9 p.m. At Manali, the highs were around 300 microgram/cubic metre around the same time.

Source: The Hindu November 15, 2020 19:45 UTC