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Emission from firecrackers less this Diwali: study

Palam and Noida were the most polluted, while Aya Nagar was the least polluted on Diwali night— File Photo

Palam and Noida were the most polluted, while Aya Nagar was the least polluted on Diwali night— File Photo  

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But levels of the dangerous pollutant PM 2.5 saw a spike from last year

The emission from firecrackers was 26 per cent less this Diwali as compared to previous years, but the levels of the dangerous pollutant PM 2.5 saw a spike from last year, as per a study released on Saturday.

The System of Air Quality and Weather Forecasting And Research (SAFAR) analysed the levels of nine different pollutants before, on and after Diwali, which was on November 11.

“There is no doubt that air quality of Delhi was in 'severe' range on November 11 and most of the time on the next day,” said the report.

The leading pollutant on Diwali was the finer PM2.5, with a 24-hour average of 258 micrograms per cubic metre, up from 230.8 from last Diwali. However, the levels of PM10 were at an “all-time low” for Diwali and post-Diwali days. The 24-hour average for PM10 fell from 407.4 micrograms per cubic metre last Diwali to 386.

“Offline SAFAR forecasting model analysis confirms that higher wind speed did play a lead role in rapidly dispersing the pollution, but the emission from firecrackers during Diwali 2015 has reduced by 26 per cent as compared to previous years, which is highly significant,” reads the report.

It adds that the contribution of wind speed dispersing pollution was around 40 per cent.

The study found that the share of PM2.5, which is the most dangerous for health, was very high compared to bigger particles.

In the NCR, Palam and Noida were the most polluted, with Aya Nagar being the least polluted on Diwali night.

Though there has been a fall in temperatures after Diwali and the PM2.5 level remains high, SAFAR said conditions were unfavourable for formation of haze over the next three days.

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Printable version | Jan 26, 2020 5:23:53 PM | https://www.thehindu.com/news/national/other-states/emission-from-firecrackers-less-this-diwali-study/article7906804.ece

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