Historically spared from severe smog due to steady ocean winds, the metropolis is seeing its natural defense compromised by ongoing construction that generates dust and traps emissions behind high-rise clusters. At the same time, worsening emissions from traffic, building sites, and industry are compounding seasonal air degradation. According to Central Pollution Control Board data analyzed by Bloomberg, PM2.5 concentrations more than tripled in October compared to September levels. Environmental researchers warn that climate change-induced heat and humidity could further stall these vital breezes, leaving residents increasingly vulnerable.
Key points
The city is on track for its sharpest post-monsoon decline in air quality recorded since…: The city is on track for its sharpest post-monsoon decline in air quality recorded since at least 2019.
Air pollution naturally intensifies after the monsoon season and is expected to reach pea…: Air pollution naturally intensifies after the monsoon season and is expected to reach peak levels between late November and February.
Projected climate shifts bringing hotter and more humid conditions threaten to permanentl…: Projected climate shifts bringing hotter and more humid conditions threaten to permanently weaken the sea breezes that disperse urban pollution.
Sources checked by our analysis pipeline: 1
The city’s average daily air quality index more than doubled to 102 through Oct. 27, from 45.4 in September, according to a Bloomberg analysis of Central Pollution Control Board data. Mumbai has even ranked as India’s most polluted city, according to live readings from Swiss air-quality technology company IQAir.
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The surge puts the metropolis on track for its sharpest deterioration in air quality during the post-monsoon transition since at least 2019. It’s only the second time in seven years that Mumbai’s average October air quality index has topped 100, a level India classifies as unhealthy. Concentrations of PM2.5, fine airborne particles that can penetrate deep into the lungs, more than tripled from September, IQAir data showed.
Historically, strong coastal winds have helped disperse emissions and spared the city from the persistent smog that blankets parts of northern India, according to atmospheric scientist Gufran Beig, founder of India’s first advanced air-quality forecasting system, SAFAR.
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