The level of respirable suspended particulate matter (RSPM) at a traffic intersection each in T.Nagar and Kilpauk was 88 microgram/cubic metre and 80 microgram/cubic metre respectively during in the 24-hour period ending 6 a.m. on Wednesday. The permissible limit for RSPM is 100 microgram/cubic metre, said a press release from TNPCB.

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