Delhi-NCR industrial air pollution regulation

The Central Pollution Control Board (CPCB) has initiated enforcement actions against industrial units in the Delhi-NCR region for failing to meet updated air pollution standards. Following a revised particulate matter emission limit implemented on October 1, 2026, the CPCB directed authorities in Delhi, Haryana, Uttar Pradesh, and Rajasthan to issue show-cause notices to non-compliant industries. These include 17 categories of highly polluting sectors, such as metal industries, food processing, and textile units. Failure to provide proof of work orders for Air Pollution Control Devices within five days can result in closure orders.

In response to concerns regarding data discrepancies between official readings and private applications, the CPCB defended its National Air Quality Index (NAQI) methodology. The board clarified that differences in values stem from the use of 24-hour averages rather than hourly peaks. Additionally, the CPCB explained that the index cap of 500 is a design feature, as levels above 500 remain within the ‘Severe’ category and represent similar health risks.