With Chandigarh recording lesser respirable suspended particulate matter (RSPM) levels on Diwali this year, it seems that the ‘Green Diwali’ campaigns did not go in vain. However, the noise level across the city remained much higher than the permissible limit, besides exceeding the previous year.
The RSPM levels which were recorded to be 218 microgram per cubic metre and 260 microgram per cubic metre at two locations last year, came down to 124 and 189, respectively, this year, said Chandigarh Pollution Control Committee (CPCC) officials on Thursday. They said the RSPM levels were lower across the city by 30-40% as compared to last year.
The CPCC which monitored the air quality and noise levels on Diwali night in the city had also collected the data a week before Diwali from three locations — Sectors 17, 22 and 29.
Going by the data, RSPM level in the air on Diwali night was much more than the permissible limit of 100 microgram per cubic metre, but less than last year.
Meanwhile, the oxides of nitrogen levels at all the locations were within the permissible limit, the sulphur dioxide level was below detection limit (BDL) at all the three locations.
However, the noise level witnessed an increase on Diwali this year as compared to last year. In 2014, the noise level on Diwali during the peak hours (8pm to 10 pm) in Sector 22 was recorded at 82.9dB (A), while, this year, the noise level was 85.8 dB (A). In Sector 29, it was 75 dB (A) last year, while it increased to 83 dB (A) this year and in Sector 17, the noise level was 65.8 dB(A) last year and 67.2 dB(A) this year.
Officials said in comparison to the last year, the noise level was higher between 8 pm to 10 pm in Sectors 22 and 29 and less in Sector 17 this year.