India, Dec. 1 -- Experts have attributed the spike in the Air Quality Index (AQI) in Mumbai and its satellite cities to an increase in construction activities fuelled by various infrastructure projects as well as vehicular pollution. On Sunday, the average AQI of Mumbai was 104, which fell in the 'moderate' category. However, the AQI in some parts, like the Bandra Kurla Complex, was in the 'severe' range.

There are six AQI categories, which are good (0-50), satisfactory (51-100), moderately polluted (101-200), poor (201-300), very poor (301-400), and severe (401-500).

Angshuman Modak, a climate scientist with the Indian Institute of Technology Bombay, attributed the spike in the AQI level to construction activities and vehicular emissio...