Washed, But Not Clean: No Good-Air Days In Last 2 Yrs
Since monsoon months are the cleanest as rain helps in settling down the pollutants, the city's lowest AQI recorded in 2025 was 51 in the satisfactory category on July 15. In 2024, the city saw the lowest AQI at 53 in the same category on Aug 8.
Experts said that due to high emissions, heavy rainfall — measuring more than 64.5mm — could not aid in ensuring a good air day. On Aug 9 this year, Safdarjung, the city's base station, logged 79mm of rainfall.
It also received heavy rainfall at 77mm on May 2, 81.2mm on May 25 and 68.1mm on July 29.
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Anumita Roychowdhury, executive director (research and advocacy) at Centre for Science and Environment, said the intense rainfall cleansed the particulates and dust. "But it is still difficult to attain sustained good air days due to high background levels of pollution in the region. Moreover, gases like ozone and NOx become more prominent during this season.
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At the same time, the systemic action for pollution control continues to remain inadequate," she said.
Sunil Dahiya, founder and lead analyst of EnviroCatalysts, said Delhi's air quality was dependent on emissions and meteorology. "Delhi has not seen a good air day for almost two years as we haven't reduced the emissions at source and meteorology was unfavourable," Dahiya pointed out.
The data since 2015, when Central Pollution Control Board started calculating AQI, shows that good air days were seen when Delhi recorded an intense spell of rain or there was a lockdown or restriction on polluting activities.
For instance, 2023 recorded just one good air day on Sept 10 with an AQI of 45 following rain and restrictions imposed due to the G20 Summit. Since 2015, the city has witnessed only 14 good air days.
No good air day was reported in 2015, 2016 and 2018, but Delhi witnessed two such days in 2017 during the monsoon, on July 30 and 31. Similarly, two good air days were witnessed in 2019 when AQI touched 49 on two consecutive days — Aug 18 and 19. In 2020, the city saw five good air days — one in March during the Covid-19 lockdown and four in Aug during the monsoon.
The capital saw only one good air day in 2021 on Oct 18 when AQI dipped to 46 due to incessant rain. Three such days were reported in 2022 in Sept and Oct with rain again playing a crucial role in cleaning the air.
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