NEW DELHI: The Centre's panel on Delhi-NCR's air quality on Sunday revoked Stage-III curbs under the Graded Response Action Plan (GRAP) amid a dip in air pollution levels due to favourable meteorological conditions, according to an official order.
Light rainfall in and around Delhi triggered by a Western Disturbance -- weather systems that originate in the Mediterranean region and bring winter rain and snow to northwest India -- significantly improved the city's air quality.
The national capital's air quality index (AQI) stood at 278 at 4 PM on Sunday, 72 points below the 350-mark threshold for the implementation of Stage-III curbs, which include a ban on non-essential construction work.
Another Western Disturbance is likely to affect northwest India around January 14, 15.
GRAP Stage 3, which was brought back on Thursday, entails a ban on non-essential construction work.
Classes up to grade V are required to shift to hybrid mode under Stage 3.
Parents and students have the option to choose online education wherever available.
Under Stage 3, the use of BS-III petrol and BS-IV diesel cars (4-wheelers) is restricted in Delhi and nearby NCR districts.
Persons with disabilities are exempt.
Stage 3 also bans non-essential diesel-operated medium goods vehicles with BS-IV or older standards in Delhi.
During winters, the Delhi-NCR region enforces restrictions under GRAP, which categorizes air quality into four stages Stage I (Poor, AQI 201-300), Stage II (Very Poor, AQI 301-400), Stage III (Severe, AQI 401-450), and Stage IV (Severe Plus, AQI above 450).
Unfavourable meteorological conditions, combined with vehicle emissions, paddy-straw burning, firecrackers, and other local pollution sources, lead to hazardous air quality levels in Delhi-NCR during winters.