CHENNAI: The level of total suspended particulate matter in the ambient air at a traffic intersection in Kilpauk during 24 hour ending 6 a.m. on Wednesday was 317 microgram/cubic metre. The permissible limit for TSPM is 200 microgram/cubic metre. According to data from the TNPCB, the level of respirable suspended particulate matter at the location was 146 microgram/cubic metre as against the permissible 100 microgram/cubic metre.

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