Mumbai Air Cleaner This Diwali, But Future Uncertain

Mumbai's air quality saw its cleanest Diwali afternoon in four years on Sunday, with the Air Quality Index (AQI) recorded at 131 around 1 pm. This reading was lower than the previous three years, but still falls within the 'moderate' band, which can cause breathing discomfort for sensitive individuals. This marks the fourth consecutive Diwali where the city's air quality has been rated moderate, and this reading was taken before the night's firecrackers were set off.

Atmospheric scientist Gufran Beig explained that a strong sea breeze, resulting from a recent wind reversal over the past 48 hours, helped control pollutant concentrations. He noted that similar conditions had recently improved air quality in Delhi. Beig warned that Monday, November 9, could see a further decline in AQI as pollutants from the previous night's celebrations linger in the air.

Traditionally, Mumbai's air quality deteriorates after Diwali due to increased pollution from fireworks. This year, air quality had already started worsening in early October. The El Niño phenomenon is also a factor, as it tends to slow wind speeds and reduce rainfall, contributing to the trapping of pollutants. On Sunday, 20 out of 26 monitoring stations registered AQI levels above 100.