Delhi releases air quality data from Diwali night; pollution severely exceeded limits

Data gaps at multiple air quality monitoring stations across the national capital coincided with a sharp deterioration in air quality on the evening of Diwali celebrations, according to information now made public. The delayed release of readings shows PM2.5 concentrations reaching alarming levels that far exceeded safe exposure thresholds set by Indian regulatory authorities.

The absence of real-time data from several monitoring points during the critical hours had raised concerns about the completeness of air quality records during one of Delhi's most pollution-intensive nights of the year. Diwali festivities, marked by widespread firecracker bursting, typically trigger a spike in particulate matter across the region.

PM2.5 refers to fine particulate matter measuring 2.5 micrometers or smaller, which can penetrate deep into the lungs and bloodstream, posing significant health risks. The national standard permits PM2.5 levels of up to 40 micrograms per cubic meter for a 24-hour average, making the recorded concentrations a major public health concern.

The release of the missing Diwali night data adds to growing documentation of seasonal air quality crises in Delhi, which frequently ranks among the world's most polluted capital cities during winter months.