New stations on periphery may be clouding AQI data in Delhi, HT analysis shows | Latest News Delhi - Hindustan Times

The Hindustan Times conducted an examination of Delhi's air‑quality monitoring network after several new stations were installed on the city's periphery. These stations, intended to provide a more comprehensive picture of pollution levels, appear to be reporting values that differ significantly from those recorded by older, centrally located monitors. The discrepancy has prompted experts to question whether the combined data set is being weighted appropriately, potentially leading to an overall AQI that does not reflect the true exposure experienced by residents in densely populated areas.

Air‑quality index (AQI) figures are used by authorities to issue health advisories and guide policy decisions on traffic, industry, and construction. When peripheral stations, which often record lower pollutant concentrations due to fewer nearby sources, are given equal influence in the city‑wide average, the resulting AQI may appear more favorable than the conditions in high‑traffic zones. Researchers highlighted the need for a calibrated approach that accounts for geographic variations and population density, ensuring that the index remains a reliable tool for public health protection.

The findings are significant for Delhi's ongoing battle against air pollution, a problem that affects millions of people and contributes to respiratory illnesses. Policymakers may need to revisit the methodology used to compile AQI data, possibly introducing weighting factors or separate reporting for different zones. Accurate information will be essential for designing targeted interventions, such as traffic restrictions or industrial emission controls, that can effectively improve air quality for the city's residents.