Why is Mumbai experiencing hazy skies even with a moderate AQI?

Mumbai's haze is caused by fine secondary particles and meteorological factors like low wind speeds and temperatures, which trap pollutants near the ground, even when the overall AQI is moderate.

What role does urban planning play in Mumbai's haze?

High-rise buildings and urban design can obstruct natural wind flow, preventing pollutants from dispersing and contributing to the stagnation of haze within the city.

What are the health risks associated with Mumbai's toxic haze?

The toxic haze can lead to respiratory and cardiovascular diseases, neurological issues, and skin problems, with children being particularly susceptible to long-term lung damage.

Home / Environment / Mumbai Haze: Why Skies Are Grey Despite Moderate AQI

Mumbai Haze: Why Skies Are Grey Despite Moderate AQI

31 Jan

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Summary

Haze is caused by secondary particles from reactions and meteorological factors.
Low winter wind speeds and temperatures trap pollutants near the ground.
Urban planning, like high-rises, obstructs airflow, worsening pollution.

Mumbai Haze: Why Skies Are Grey Despite Moderate AQI

Mumbai has been experiencing persistent haze, with an average AQI of 127 on January 31, 2026, classifying it as moderate. This has led to poor visibility and public concern, as the hazy conditions seem to contradict official readings that typically range from satisfactory to moderate.

The haze is primarily composed of fine secondary particles. These form from the reaction of nitrogen oxides and hydrocarbons in sunlight. Environmental scientist Rakesh Kumar explains that meteorology, particularly calmer winds, plays a significant role in trapping these particles.

During winter months like January, Mumbai faces slower wind speeds and lower temperatures. This meteorological pattern, as noted by Sunil Dahiya, leads to the stagnation of pollutants close to the ground, exacerbating the hazy conditions.