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Less air pollution and noise recorded in Chennai on Diwali compared to previous years


Despite Tamil Nadu not banning firecrackers and restricting the setting off of fireworks to 2 hours on Diwali day, which was scoffed at, Chennai’s air pollution and noise have decreased compared to 2019, based on observations made. by the Tamil Nadu Pollution Control Board (TNPCB).

As of November 14, the Central Pollution Control Board (CPCB) rated Chennai’s air quality as “satisfactory” with prominent pollutants such as PM 10, PM 2.5 and CO, while Delhi was categorized as “severe” .

Four parameters (PM10, PM2.5, SO2 and NO2) are monitored to evaluate the air quality index or AQI. To study ambient air quality and noise pollution levels, TNPCB manually monitored five locations in the city and has reported the AQI in Besant Nagar (62), T Nagar (72), Nungambakkam (59), Triplicane (107) and Sowcarpet (100). ).

The considerable reduction in the level of pollution and noise level is mainly due to public cooperation following Supreme Court guidelines, said a TNPCB statement adding that awareness at the time of the Covid-19 pandemic could also be a factor. Studies have shown a link between poor air quality and a reduced ability to recover from the coronavirus.

According to their report, PM10 values ​​were found to be within limits, except in Triplicane and Sowcarpet, where it was marginally higher and PM 2.5 were within limits. The gaseous pollutants SO2 and NO2 were also within the prescribed standards. The survey was conducted from 6 am to 6 am in commercial and residential locations.

In 2019, on Diwali, which fell on October 27, the AQI was highest at Sowcarpet station with 119 and lowest at Nungambakkam station with 85. CPCB guidelines have also instructed authorities to conduct a short-term monitoring for 14 days (one week before and after Diwali)

On a normal day on November 9, the AQI was observed to be highest at T Nagar (65). In 2019, a week before Diwali on October 20, the highest value was recorded in the same place with 81.

Noise levels that were monitored for 24 hours and measured in dB (A) Leq were reported as (78), T Nagar (78), Nungambakkam (71), Triplicane (75), and Sowcarpet (76). The noise level ranged between 54 dB (A) and 69 dB (A) before Diwali on November 9 and ranged between 71dB (A) and 78 dB (A) on Diwali this year, which turned out to be lower in comparison. with the previous year. said a TNPCB statement.

On Diwali day on November 14, PM10 results ranged from 52 to 111 ug / m3 during against the prescribed standard of 100 ug / m3. PM2.5. results range from 32 to 59 micrograms / m3 versus the prescribed standard of 60 ug / m3.

Original source