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Devsar, Haryana, situated at approximately 28.76°N, 76.08°E, occupies a geographically significant position within the broader Indo-Gangetic Plain. The town’s terrain is predominantly flat, characteristic of the alluvial plains formed by the Yamuna River and its tributaries. This flatness, while facilitating agricultural activity, contributes to air quality challenges due to reduced atmospheric mixing and potential for pollutant trapping. Devsar’s elevation is relatively low, around 220 meters above sea level, further exacerbating these conditions. The surrounding landscape is a mosaic of agricultural fields – primarily wheat and rice cultivation – interspersed with small villages and pockets of scrubland. This agricultural zone, while vital for the regional economy, is a source of particulate matter from crop residue burning, particularly during the post-harvest season. The urban–rural gradient around Devsar is gradual, with the town acting as a local service center for the surrounding agricultural communities. While not directly adjacent to a major river, the proximity to the Yamuna basin influences regional weather patterns and can impact the transport of pollutants. The town’s location within Haryana, a state with a significant industrial belt to the west and north, means it is susceptible to the advection of pollutants from those areas. The lack of significant topographic barriers allows for the relatively unimpeded movement of air masses, potentially carrying pollutants from distant sources. The flat, fertile land encourages intensive farming practices, which, while productive, can contribute to localized air quality degradation.

Devsar’s air quality follows a distinct seasonal pattern dictated by the interplay of meteorological factors and regional pollution sources. The dry winter months (November to February) consistently present the most challenging conditions. Temperature inversions, common during this period, trap pollutants close to the ground, leading to elevated concentrations. Agricultural burning, a widespread practice following the harvest of rice and wheat, releases substantial quantities of particulate matter, significantly worsening air quality. Fog, frequent during these months, further restricts atmospheric dispersion. Spring (March-April) brings a slight improvement as temperatures rise and winds increase, aiding in pollutant dispersal, though dust storms originating from the Thar Desert can occasionally impact air quality. The onset of the monsoon season (June-September) typically provides a period of respite, as rainfall washes away pollutants and strong winds clear the atmosphere. However, heavy rainfall events can also lead to localized flooding and the release of pollutants from stagnant water. The post-monsoon season (October) sees a gradual deterioration as wind speeds decrease and temperatures begin to fall. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the winter months, limiting outdoor exposure and using air purifiers when possible. During periods of agricultural burning, wearing N95 masks is recommended. Maintaining indoor air quality through ventilation and filtration is crucial throughout the year, particularly during peak pollution periods.