NEW DELHI, Dec 14 (Reuters) – India tightened anti-pollution measures in Delhi and adjoining areas after the capital’s air quality deteriorated to ‍the season’s worst.

The Commission for Air Quality Management invoked stage four, the highest level, of the Graded Response Action Plan for Delhi and surrounding areas on Saturday evening, according to an advisory by ‌India’s environment ministry.

On Sunday, Delhi’s ‌air quality was “severe” with official index readings over 450 across several monitoring stations, up from 430 on Saturday and the highest so far this winter season, Central Pollution Control Board data showed. Readings below 50 are “good”.

The curbs ban the entry ‍of older diesel trucks, suspend construction, including on public projects, and impose hybrid schooling.

The area,

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