India, Dec. 1 -- The civic authorities in Mumbai have begun implementing the Graded Response Action Plan-4 (GRAP-4) to curb the Maharashtra capital's worsening air quality over the past few days. As the city continues to remain in haze, the authorities have decided to apply the measure in the worst-affected regions of the city.

The move comes as the Air Quality Index (AQI) in Mumbai improved to the 'moderate' category on Monday, with a reading of 103 as of 4 pm, Central Pollution Control Board (CPCB) data showed.

Notably, areas that have recorded "poor" air quality continuously in November, and also dropped to "very poor" air quality (an AQI between 301-400), include Mazgaon, Malad and Deonar, as mentioned in an earlier HT report.

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