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Guru Har Sahāi, a small town nestled in the fertile plains of Punjab, India, occupies a geographically significant position within the broader Indo-Gangetic Plain. Located at approximately 30.7086° N, 74.4041° E, the town’s terrain is predominantly flat, characteristic of the alluvial soil deposits left by the Indus River and its tributaries over millennia. The surrounding landscape is overwhelmingly agricultural, a patchwork of cultivated fields primarily dedicated to wheat, rice, and maize cultivation – a typical feature of Punjab’s rural economy. This intensive agricultural activity contributes significantly to regional air quality challenges, particularly through the burning of crop residue after harvest. Guru Har Sahāi sits within a gradual urban–rural gradient, transitioning from the denser urban centres of Ludhiana and Jalandhar to the quieter, agrarian communities further afield. The town itself exhibits a modest urban character, with a mix of residential areas, local markets, and small-scale commercial establishments. While not directly adjacent to any major river, the region’s groundwater table is relatively high, influencing local humidity and potentially impacting atmospheric stability. The town’s elevation, relatively low at around 230 meters above sea level, contributes to the potential for temperature inversions, especially during cooler months, trapping pollutants near the ground. The proximity to industrial belts in nearby cities, while not immediately adjacent, means that Guru Har Sahāi is susceptible to the advection of pollutants from those sources, further complicating its air quality profile.

The air quality in Guru Har Sahāi follows a distinct seasonal pattern heavily influenced by meteorological conditions and agricultural practices. The dry winter months (November to February) are typically the most challenging. Cold temperatures frequently lead to temperature inversions, where a layer of warm air sits above cooler air near the ground, preventing vertical mixing and trapping pollutants. Dense fog, a common occurrence during this period, further exacerbates the problem by reducing visibility and hindering pollutant dispersion. The burning of crop residue, a widespread practice after the harvest of rice and wheat, releases substantial amounts of particulate matter and other harmful gases, significantly degrading air quality. Spring (March to May) sees a gradual improvement as temperatures rise and winds increase, aiding in pollutant dispersal. However, dust storms originating from the Thar Desert can occasionally impact air quality. The monsoon season (June to September) brings relief with increased rainfall, which helps to wash pollutants from the atmosphere. However, heavy rainfall can also lead to waterlogging and the release of methane from flooded fields. Finally, the post-monsoon period (October) often sees a return to poorer air quality as agricultural activity ramps up again, and the conditions become more conducive to temperature inversions. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the winter months and avoid prolonged outdoor exposure when air quality is visibly poor. Staying indoors with air purifiers and wearing masks can offer some protection.