New Delhi: Most cities in Maharashtra and Gujarat showed an annual PM2.5 level upward trend, with a decline by 2020 (during blockade) and a rebound and upward trend in 2021. On Wednesday, according to an analysis by the Center for Science and Environment (CSE).
Air pollution is a rapid concern in the two western states, and a new analysis of regional air pollution levels shows that cities in Gujarat are more polluted than cities in Maharashtra.
The analysis included 56 continuous air quality monitoring stations (CAAQMS) spanning 15 cities in two states.
Vatva and Ankleshwar in Gujarat have the most polluted air in the region, with an average PM2.5 of 2021 of 67 micrograms per cubic meter in 2021. This is followed by Vapi and Ahmedabad, with 2021 averages of 54 micrograms and 53 micrograms per cubic meter, respectively.
In Maharashtra, the industrial city of Chandrapur has recorded a level slightly above the annual standard of 43 micrograms per cubic meter. Other stations meet the annual criteria, although all showed an upward trend in 2021 after the decline in 2020.
Despite the low annual level, the cities of Maharashtra experienced many days with “poor” and “very poor” AQI compared to Gujarat.
With a very poor AQI of 102 days, Gujarat’s Ankleshwar is the healthiest day in the region, followed by Kalyan (84 days), Vatva (75 days) and Navi Mumbai (54 days). rice field.
Vapi had a poor AQI for 48 days and a very poor AQI, but that data was lost for 138 days (mainly in winter). Mumbai recorded a poor AQI and a very poor AQI for 42 days, despite meeting the annual criteria.
Levels during weekly high-contamination episodes of winter can be more than double the annual concentration in some cities. During the worst weekly pollution episodes of winter, PM2.5 concentrations can be significantly higher than the annual PM2.5 average — about twice as high in some cities.
“This analysis of real-time air quality data from 2019 to 2021 shows that the downward trend in pollution caused by the 2020 pandemic blockade phase is changing. Pollution levels are likely to bounce back. In many cases, the level is even higher than in 2019. This is the urgency to expand action across all sectors to prevent further deterioration in the region and thwart trends in the region. “We emphasize that,” said Anumi Taro Choudhry, Executive Director of Research and Advocacy at CSE. ..
However, despite automation, this data still has the challenges of data gaps and quality. A review of data availability from regional automated monitoring stations under CPCB’s CAAQMS program points to a major data gap. CSE analysis showed that the availability of data calculated as days with appropriate PM2.5 data to calculate a valid 24-hour average was low in 5 of the 12 cities in the region.
https://www.siasat.com/air-pollution-rises-in-maha-guj-after-brief-lull-due-to-lockdowns-cse-2261171/ Increased air pollution in Guji’s Maha after a temporary dip due to the blockade: CSE