MUMBAI: For the first time in the post-monsoon season, Mumbai’s air quality index (AQI) declined to 113 on Tuesday. Although still in the moderate air quality category, it was worse than Delhi’s 83, which denotes a satisfactory AQI, readings by the System of Air Quality and Weather Forecasting and Research (SAFAR) have suggested.
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Parts of Mumbai’s suburbs, though, recorded “very poor” AQI on Tuesday with Andheri at 346, Mazgaon 317 and Navi Mumbai 317. A few suburbs such as Chembur and Malad were badly hit too and recorded a poor AQI while Bandra-Kurla Complex, Borivli, Worli, Bhandup and Colaba were in the moderate category.
Delhi is considered among the most polluted cities in the world, and normally from November, as winter sets in, pollution rises across the country. The AQI measures the count of the concentration of carcinogenic particulate matter (PM) 2.5 in the air. Mumbai’s AQI was 115 on Monday while Delhi’s count was higher at 165.
For the second consecutive day on Tuesday, lower wind speed and a rise in humidity led to a “suffocating day” in Mumbai with a thick smog cover over the city, said experts. Experts attributed the dust pollution to cold wind blowing in from the Western Ghats hitting warmer air along the coast. As a result, warmer air with dust and smoke remained stagnant over the coastal Mumbai, they added.
An AQI of 201-300 is considered poor, 301-400 very poor and 401-500 severe while that below 50 is good, 51-100 satisfactory and 101-200 moderate.





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