New Delhi, Dec. 24 -- Stringent anti-pollution measure GRAP-4 has been revoked in Delhi as air quality in the national capital improved to the 'poor' category, according to an official order. Delhi's air quality index (AQI) stood at 271, improving from 412 (severe) a day earlier. However, curbs under Stages 1, 2 and 3 will remain in force to prevent any further deterioration in air quality.

The order read: "Noting the continuous improvement in the AQI levels of Delhi, the Sub-Committee on GRAP in its meeting held today reviewed the air quality scenario in the region as well as the IMD/IITM forecasts and observed that the AQI of Delhi has shown significant improvement since yesterday night owing to high winds and favorable meteorological ...