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Ūjhāna, nestled in Haryana, India (29.7155° N, 76.1341° E), occupies a geographically significant position within the Indo-Gangetic Plain. The town’s terrain is predominantly flat, characteristic of the alluvial plains formed by the Indus and Ganges river systems, resulting in minimal elevation changes. This flatness, while agriculturally advantageous, contributes to air quality challenges. Ūjhāna lies within a region heavily reliant on agriculture, particularly wheat and rice cultivation, which introduces seasonal biomass burning as a significant pollution source. The surrounding landscape is a mosaic of fertile farmland interspersed with small villages and scattered rural settlements, creating a gradual urban–rural gradient. While not directly adjacent to a major river, the region’s groundwater table is high, influencing local humidity and potentially affecting the dispersion of pollutants. The town’s proximity to industrial belts in nearby cities like Panipat and Sonipat, though not immediately bordering them, means it’s susceptible to the advection of industrial emissions. The prevailing westerly winds often carry pollutants from these industrial zones eastward. The lack of significant topographical barriers further exacerbates this issue, allowing pollutants to accumulate. The flat, expansive nature of the plain, combined with intensive agricultural practices and regional industrial activity, creates a complex interplay of factors that influence Ūjhāna’s air quality, making it particularly vulnerable to seasonal pollution spikes and persistent background levels.

Ūjhāna’s air quality follows a distinct seasonal pattern dictated by meteorological conditions and agricultural practices. The dry, cool months of October through March present the most challenging period. Stubble burning, a widespread practice following the rice harvest, releases massive quantities of particulate matter and other pollutants, significantly degrading air quality. Temperature inversions, common during these months, trap pollutants near the ground, further intensifying the problem. Fog, frequently occurring in December and January, reduces visibility and hinders pollutant dispersion. The monsoon season (July-September) brings relief, with rainfall washing away pollutants and increased wind speeds aiding in their dispersal. However, even during the monsoon, localized pollution from agricultural activities and sporadic industrial emissions can occur. The pre-monsoon months (April-June) see a gradual increase in temperatures and a decrease in rainfall, leading to a slow deterioration in air quality as stubble burning begins again on a smaller scale. Spring (March-April) offers a brief window of relatively cleaner air, but this is often short-lived. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry winter months, limiting outdoor exposure and using air purifiers when possible. During periods of heavy stubble burning, even healthy individuals should minimize strenuous outdoor activities.