Air quality in the national capital deteriorated sharply on Tuesday evening, with the 24-hour average Air Quality Index (AQI) rising to 372 — a level classified as very poor and edging close to the severe range. The Central Pollution Control Board’s Sameer app showed 16 of the 39 monitoring stations had readings above 400, placing them in the severe category and posing serious health risks for residents.
What the numbers show
The CPCB recorded a 24-hour average AQI of 372 at 4 pm on Tuesday, up from 304 on Monday and 279 on Sunday. Sixteen monitoring stations registered AQI levels above 400 — readings that are known to seriously impact health. Areas reporting severe values included Burari, Anand Vihar, Mundka, Bawana, Vivek Vihar, Rohini, Sonia Vihar, Ashok Vihar and Punjabi Bagh among others.
Under CPCB classifications, AQI bands run from 0–50 (good) to 401–500 (severe). With multiple stations already in the severe bracket and the citywide average in the very poor zone, authorities and health professionals have urged residents, particularly vulnerable groups, to take precautions.
Health implications and advice
Medical experts warn that prolonged exposure at these AQI levels can aggravate respiratory and cardiovascular conditions, and may lead to increased hospital visits for breathing difficulties, chest pain and other related symptoms. Children, older people and those with pre-existing illnesses are at heightened risk.
Public health recommendations include limiting outdoor activities, avoiding strenuous exercise outdoors, using N95 or equivalent masks when venturing outside, and using air purifiers indoors where possible. Those experiencing severe symptoms — such as persistent chest pain, breathlessness, or fainting — are advised to seek immediate medical attention.
Sources and local contributors
The CPCB’s detailed contribution analysis for Tuesday attributed 18.4 per cent of Delhi’s pollution to the transport sector, making it the largest local contributor. Peripheral industries contributed 9.2 per cent, while emissions from neighbouring urban and industrial areas were also significant: Noida (8.2%), Baghpat (6.2%), Ghaziabad (4.6%), Panipat (3.3%) and Gurugram (2.9%). Transport emissions are forecast to contribute roughly 15.6 per cent on Wednesday.
The mixture of local vehicular emissions, industrial outflow from the National Capital Region and meteorological conditions that trap pollutants near the surface together explain the recent rises in AQI.
Weather and short-term forecast
Meteorological conditions are playing a central role. The Air Quality Early Warning System for Delhi has indicated that the city’s AQI is likely to remain in the very poor category over the coming days, with mist and haze forecast at night. On Tuesday, surface winds blew from the south-west at calm to light speeds, increasing slightly to below 5 kmph in the afternoon and expected to pick up to about 10 kmph from the north during the evening and night. These light winds and stable conditions reduce pollutant dispersion.
The India Meteorological Department reported a maximum temperature of 25.8°C for Tuesday — 0.5°C above normal — and a minimum of 9.6°C, 0.1°C above normal. For Wednesday, the IMD forecasted fog with expected highs and lows of about 24°C and 8°C respectively.
Government and civic response
With multiple stations in the severe range, municipal and state agencies have been urged to step up advisories and mitigation measures. Typical responses during such episodes include restricting non-essential outdoor work, advising schools to limit outdoor activities for children, and enhancing monitoring and enforcement of pollution control measures for industries and construction sites.
Longer-term solutions continue to focus on cleaner public transport, stricter emissions standards, phasing out older polluting vehicles, industrial emission controls and coordinated action across neighbouring districts that supply a significant share of the capital’s pollution.