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Noise levels were another parameter monitored by the pollution board and the data observed that noise levels were same in day time pre-Diwali and during Diwali while night time values shot up by 2.3 dB in industrial areas

Levels of particulate matters PM2.5 and PM10 reduce significantly during night curfew, subsequent lockdown in city

According to TSPCB, noise levels also dropped in day and night time compared to last year