The Respirable Suspended Particulate Matter (RSPM) level at a traffic intersection in T.Nagar and a residential area in Anna Nagar was 55 microgram/cubic metre and 41 microgram/cubic metre respectively during the 24-hour period ending 6 a.m. on Friday.

The permissible limit is 100 microgram/cubic metre, a press release from TNPCB said.

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