August 18, 2022
Excess rain gives Delhi 24 ‘satisfactory’ air quality days this July

Last Update: 31 July 2022, 21:58 IST

New Delhi: A pedestrian takes cover from the monsoon rains in New Delhi, Monday, July 11, 2022. (PTI photo)

Only July 2020 was better with an average AQI of 84 as the city recorded a significant drop in pollution levels that year, as a strict lockdown was imposed to contain the spread of Covid.

Delhi recorded 24 “satisfactory” air quality days this month due to surplus rainfall, making it the cleanest July for the city since 2015, when the Central Pollution Control Board began maintaining AQI data. The average air quality index this July was 87. Only in July 2020 was it better with an average AQI of 84 – the city had recorded a significant drop in pollution levels that year due to the strict lockdown to contain the spread of Covid.

Delhi had recorded 25 ‘satisfactory’, four ‘moderate’ and two ‘poor’ air quality days in July 2020. An air quality index (AQI) between zero and 50 is considered “good”, 51 and 100 “satisfactory”, 101 and 200. “moderate”, 201 and 300 “poor”, 301 and 400 “very poor”, and 401 and 500 “severe”.

Not a single poor, very poor or severe air quality day was recorded in the capital this July. The city had recorded an average AQI of 100 in 2021; 134 in 2019; 104 in 2018; 100 in 2017; According to CPCB data, 144 in 2016 and 138 in 2015.

Delhi’s primary meteorological station Safdarjung Observatory recorded 19 rainy days, the highest in at least a decade, and 286.3 mm of rain this month against the normal 209.7 mm. Overall, the city has received 310.8 mm of rainfall as against the normal 283.8 mm since the start of the monsoon season from June 1.

Delhi also recorded a drop in maximum temperature this month due to excess rainfall. The average maximum temperature was 35.36 degrees Celsius, the lowest since 2017.

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