The Graded Response Action Plan (GRAP) has been implemented earlier than the usual date of October 1 to control air pollution in the Delhi-NCR region during winter, as per officials.
The Commission for Air Quality Management, an autonomous body responsible for devising the strategy to enhance air quality in Delhi and nearby areas, announced on Wednesday that if the city's air quality index (AQI) reaches Stage III—'Severe' (AQI between 401 and 450), polluting buses from NCR states will not be permitted to enter Delhi.
Exceptions will be granted for CNG, BS VI, and electric buses.
The restrictions will not be applicable to buses or tempo travellers with an all-India tourist permit.
GRAP is categorised into four stages based on Delhi's air quality: 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 >450).
On Wednesday, Delhi's AQI was 115 (Moderate).
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