Samālsar, a small town nestled in the Punjab region of India (30.6364° N, 74.9983° E), occupies a geographically significant position within the Indo-Gangetic Plain. Its terrain is predominantly flat, characteristic of the fertile alluvial plains formed by the Indus and its tributaries. The elevation is relatively low, contributing to atmospheric stability and potential for pollutant accumulation. The surrounding landscape is a mosaic of agricultural fields – primarily wheat and rice cultivation – interspersed with scattered villages and occasional groves of eucalyptus and other trees. This intensive agricultural activity, while vital for the regional economy, is a significant source of air pollutants, particularly during burning seasons. Samālsar’s proximity to larger industrial belts in Ludhiana and Jalandhar, roughly 100-150 kilometers away, introduces a secondary layer of industrial emissions that can be transported by prevailing winds. The urban–rural gradient around Samālsar is gradual, with agricultural land extending almost seamlessly to the town’s periphery. The lack of significant natural barriers, such as hills or large bodies of water, further exacerbates the issue, allowing pollutants to spread easily. The absence of major rivers directly adjacent to the town means limited natural cleansing of the atmosphere through precipitation and deposition. The flat topography and prevailing wind patterns often lead to stagnant air conditions, particularly during cooler months, trapping pollutants close to the ground and intensifying local air quality challenges. The region's climate, characterized by hot summers and cool winters, also influences atmospheric mixing and pollutant dispersion.

Samālsar’s air quality follows a distinct seasonal pattern heavily influenced by agricultural practices and meteorological conditions. The post-monsoon and winter months (October to February) are typically the most challenging. Following the monsoon’s retreat, farmers engage in widespread crop residue burning to clear fields quickly for the next planting season, releasing substantial amounts of particulate matter and other pollutants. This, combined with cooler temperatures and frequent fog, creates ideal conditions for temperature inversions – where a layer of warm air traps cooler air (and pollutants) near the ground. Fog, common during these months, significantly reduces visibility and further concentrates pollutants. Spring (March-May) sees a gradual improvement as temperatures rise, promoting atmospheric mixing and dispersing pollutants. However, dust storms originating from the Thar Desert to the west can occasionally impact air quality. The monsoon season (June-September) brings relief with increased rainfall, which helps to wash away pollutants and improve air quality. However, heavy rainfall can also lead to waterlogging and the release of methane from agricultural lands. Summer months (April-June) are generally drier, but strong winds can occasionally help to disperse pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the winter months, limiting outdoor activities and wearing appropriate masks when necessary. During peak burning periods, it’s advisable to avoid prolonged exposure to outdoor air and to monitor local air quality reports. Maintaining indoor air quality through ventilation and air purifiers can also provide some protection.