New Delhi: While Delhi may have recorded five days that are categorized as ‘good’ in accordance with the air quality index in 2020, this year, despite regular locking and shower, the city has not recently recording such days.
Delhi may have received more than 500mm rainfall in July, 2.4 times normal for that month, but it does not clean enough air to be ‘good’.
Track the level of pollution in your ‘good’ aqi air is 50 or below.
The lowest rating recorded so far in the current rainy season is 57, which is classified as ‘satisfying’.
Experts say that other sources of local emissions, as well as gas pollutants such as co, O3 and NO2 can play a key role even when the rain settled PM2.5 and PM10 pollutants.
Last year, Delhi recorded five days of air quality ‘good’: one in March during Covid locking, and four in August during the rainy season period.
Monsoons blew to Delhi on July 13 and on July 19, the capital saw its first ‘heavy’ rainfall for almost 7-8 hours.
Aqi on average 24 hours that day, however, is 62 in the ‘satisfying’ category.
Heavy rain was also recorded on July 27 and July 29, but Delhi still did not record the ‘good’ air level.
In May Also, Tauktae Typhoon brought 119.3mm rain to Delhi in one day, but AQI daily average was 58.
A recent study by IIT-Kanpur analyzed sources of pollution in the summer said power plants were contributors PM2.
5 pollutants, with this study also found an increase in sulfate concentration and organic aerosol in the summer compared to the composition of chlorine and high nitrate in the winter.
From the organic aerosols found in the air in the summer, this study included burning solid fuel as the largest contributor (16.2%), followed by traffic (12.3%) and cooking (7.3%).
Sachchida N Tripathi, Head of the Department of Civil Engineering in IIT Kanpur, who conducted research in June-July 2019, said that while dust was a clear factor during the summer, source of combustion, such as power plants, identified as other major factors.
The Delhi government has recently submitted a petition at the Supreme Court who is looking for the closing of 10 thermal power plants in the national capital area that did not switch to cleaning technology.
Anumita Roy Chowdhury, Executive Director (Research and Advocacy), Center for Science and the Environment, shows that in contrast to the general belief that the rain swept pollution, it only washing particle material.
“Gas still remains a problem and can even increase because the flooded roads cause IDLING and SNARL traffic,” Chowdhury said, adding that why there was a need to reduce fuel combustion from all types.
After ‘heavy’ rainfall on July 19, Aqi was 62 that was acceptable, but it was furious and neatness caused primary pollutants to no2, followed by PM10 in the CPCB data.
On July 27, No2 was once again the main pollutants, while O3 and Co dominated the pollutants on July 29.
Dipankar Saha, the former Head of the CPCB air laboratory, said the background emissions were higher than normal in the indo-gangetic plains, with dust and localized.
Sources sometimes push aqi to ‘poor’ in the summer.
“Dust can be resolved through rain spells, but it is not easy to control other sources of pollution, which can make a significant impact for a 24-hour period,” said Saha.
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