Delhi has withdrawn the strictest set of air pollution control measures under the Graded Response Action Plan (GRAP-4) after a noticeable improvement in air quality across the region. The decision was taken by the GRAP sub-committee following a review meeting, where officials noted better atmospheric conditions aiding dispersion of pollutants.
According to the Commission for Air Quality Management, strong winds and favourable meteorological factors led to a sharp improvement in air quality from Tuesday night onwards. As a result, the Air Quality Index (AQI) in the national capital was recorded at 271 on Wednesday, placing it in the ‘poor’ category.
GRAP-4 had been imposed after AQI levels crossed the 450 mark, categorised as ‘severe-plus’, prompting emergency restrictions across sectors. With the situation easing, authorities have now rolled back the highest level of curbs, while confirming that actions under GRAP-1, GRAP-2 and GRAP-3 will remain in force.
What changes for commuters and schools
With the lifting of GRAP-4, older vehicles that were barred from operating during the peak pollution phase are now allowed back on Delhi roads. The earlier restriction permitting entry of only Bharat Stage (BS) 6 vehicles into the capital had affected nearly 1.2 million vehicles registered outside Delhi.
The Delhi government had also directed schools to run classes up to Class 11 in hybrid mode during the severe pollution phase. With the easing of restrictions, schools can now reassess operational decisions in line with the prevailing GRAP stages.
However, officials cautioned that the relief may be temporary. Forecasts by meteorological agencies indicate a possible rise in AQI levels in the coming days due to slower wind speeds. Authorities said they remain prepared to reintroduce stricter measures if pollution levels spike again.
Vehicle norms and ongoing curbs
Under the existing framework, GRAP-1 measures apply when AQI is between 201 and 300, GRAP-2 between 301 and 400, and GRAP-3 between 401 and 450. While GRAP-4 has been lifted, enforcement of emission-related norms continues.
Officials reiterated that vehicles without a valid pollution under control (PUC) certificate will not be allowed to refuel at petrol pumps. The government has maintained that vehicular emissions remain one of the biggest contributors to Delhi’s winter air pollution, accounting for a significant share of particulate matter in busy traffic corridors.