The level of Respirable Suspended Particulate Matter (RSPM) in the ambient air at a residential area in Adyar and a traffic intersection in Kilpauk during the 24-hour period ending Tuesday was 47 microgram/cubic metre and 88 microgram/cubic metre respectively. The permissible limit is 100 microgram/cubic metre, a press release from TNPCB said.

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