Delhi’s air quality worsened on Wednesday morning, with the citywide air quality index (AQI) reading reaching 377 — a level categorised as “very poor.” The deterioration comes as local authorities have put restrictions on the sale and use of fireworks into effect ahead of the Hindu festival of Diwali.
Officials said the measures are intended to limit the spike in pollution that typically accompanies the festival, when widespread use of firecrackers can sharply raise particulate matter levels. The restrictions entered force across the city as residents prepared for Diwali celebrations, which this year coincide with already elevated pollution levels.
The “very poor” AQI band signals that prolonged exposure can be harmful, particularly for children, the elderly and those with respiratory or cardiovascular conditions. Health advisories issued in past years have urged vulnerable groups to reduce time spent outdoors and to avoid strenuous physical activity when pollution readings are high.
Delhi commonly experiences a seasonal decline in air quality in the autumn and winter months, driven by a combination of local emissions, increased burning of biomass in surrounding regions and weather conditions that trap pollutants close to the ground. Authorities and environmental groups have for years highlighted the role of fireworks in exacerbating short-term pollution spikes during festival periods.
City agencies will be monitoring air quality forecasts and enforcing the new curbs while public health messages are circulated to help residents limit exposure. Meteorological conditions and the level of compliance with the restrictions will influence whether pollution levels ease or rise further in the days around Diwali.