Delhi's Diwali air quality ranks third-worst in three years amid monitoring gaps

Delhi's air quality index spiked to concerning levels during Diwali festivities, marking the third most severe pollution episode recorded during the festival period over the past three years. While seasonal stubble burning in neighbouring states and increased firecracker usage during celebrations typically degrade air quality, this year's readings point to conditions among the worst experienced during the festival season in recent memory.

However, the accuracy of pollution assessments has been compromised by a widespread failure in the capital's air quality monitoring network. Approximately 50 percent of reporting stations across Delhi abruptly stopped transmitting air quality data shortly after midnight on Diwali night, creating significant gaps in real-time pollution tracking and public health warnings.

The monitoring blackout has raised questions about the reliability of air quality data collection infrastructure and its capacity to handle peak pollution periods. Environmental and public health officials rely on continuous data streams from distributed monitoring stations to issue timely advisories and guide mitigation measures during high-pollution episodes.

During Diwali, Delhi's air quality typically deteriorates due to the combined effects of agricultural burning in Punjab and Haryana, increased firecracker emissions, and weather patterns that trap pollutants over the region. The city's vulnerability to such seasonal spikes underscores the ongoing challenge of managing air pollution during major festivals and the need for robust monitoring systems to support public health interventions.