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Asthal Bohar, nestled in Haryana, India (28.8730° N, 76.6420° E), presents a compelling case study in the intersection of rural geography and emerging air quality challenges. Situated approximately 60 kilometers southwest of Delhi, the town’s location is intrinsically linked to the broader Indo-Gangetic Plain, a vast alluvial landscape characterized by fertile agricultural land and a relatively flat terrain. The elevation is modest, around 220 meters above sea level, contributing to atmospheric stability and potential for pollutant accumulation. Asthal Bohar sits within a predominantly rural setting, transitioning gradually from agricultural fields – primarily wheat and rice cultivation – to peri-urban development as it draws closer to the Delhi-NCR region. This agricultural activity, while vital for the local economy, introduces significant sources of particulate matter through stubble burning practices, particularly during the post-harvest season. The proximity to Delhi’s industrial belt and the associated vehicular traffic further exacerbates air quality concerns. The town’s limited natural barriers – few significant hills or forests – mean that pollutants are not easily dispersed. The surrounding landscape is largely flat, dominated by farmland and scattered villages, offering minimal topographical relief to break up stagnant air masses. While not directly adjacent to a major river, the region’s groundwater table is relatively high, influencing local humidity and potentially impacting the behaviour of certain pollutants. The urban–rural gradient is subtle but noticeable, with Asthal Bohar exhibiting characteristics of both, making it vulnerable to both agricultural and industrial pollution sources.

Asthal Bohar’s air quality follows a distinct seasonal pattern heavily influenced by regional meteorology and agricultural practices. The dry winter months (October to February) consistently present the most challenging conditions. Stubble burning, a widespread practice following the rice harvest, releases massive quantities of particulate matter and noxious gases, significantly degrading air quality. Temperature inversions, common during this period, trap pollutants near the ground, preventing their dispersion. Fog, frequently occurring due to high humidity and low temperatures, further concentrates pollutants, reducing visibility and exacerbating respiratory issues. The monsoon season (July to September) brings a period of relative relief, as rainfall washes away pollutants and increased wind speeds facilitate dispersion. However, even during the monsoon, localized pollution from agricultural runoff and occasional industrial emissions can still occur. The pre-monsoon period (March to June) sees a gradual increase in temperatures and decreasing rainfall, leading to a slow deterioration in air quality as stubble burning resumes on a smaller scale. The summer months are generally drier, with higher temperatures and less frequent rainfall, which can contribute to the build-up of pollutants. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise extreme caution during the winter months, limiting outdoor exposure and using appropriate respiratory protection. During the monsoon, while air quality improves, vigilance regarding waterborne illnesses is crucial. Outdoor activities are generally more favourable during the monsoon and summer months, but always monitor local conditions.