The decision, outlined in an official order, comes a day after the curbs were imposed due to worsening air quality conditions caused by calm winds, low temperatures, and fog. The region’s air quality index (AQI) had reached 396 on Wednesday evening, classified as “very poor.”
Stage 4 measures, applied when air quality reaches “severe plus” levels, include a ban on all construction and demolition activities, restrictions on the entry of non-essential diesel trucks into Delhi, and mandatory hybrid learning modes for school classes, except for grades 10 and 12. Additionally, non-essential diesel trucks and Delhi-registered BS-IV or older diesel heavy goods vehicles were prohibited, with exceptions for essential services.
The GRAP system is implemented in Delhi-NCR during winter months, categorizing air quality into four stages: Stage 1 (Poor, AQI 201-300), Stage 2 (Very Poor, AQI 301-400), Stage 3 (Severe, AQI 401-450), and Stage 4 (Severe Plus, AQI above 450). The region’s pollution is exacerbated during this period due to unfavorable meteorological conditions, vehicle emissions, paddy stubble burning, and local sources such as firecrackers.
The CAQM has emphasised the continued enforcement of measures under earlier GRAP stages to prevent further deterioration of air quality.
(With inputs from PTI)
