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Sunām, situated in the heart of Punjab, India, occupies a relatively flat expanse of the Indo-Gangetic Plain at approximately 236 meters (774 feet) above sea level. Its coordinates (30.1300° N, 75.8000° E) place it within a predominantly agricultural landscape, characteristic of the region. The surrounding terrain is largely composed of alluvial soils, fertile and intensely cultivated, primarily with wheat, rice, and cotton. This intensive agriculture, while economically vital, contributes significantly to air quality concerns through seasonal stubble burning. Sunām isn’t directly adjacent to major bodies of water, though it benefits from the network of canals irrigating the Punjab. The city’s urban character is that of a growing regional hub, experiencing increasing vehicular traffic and small-scale industrial activity. While not a major industrial centre itself, Sunām’s proximity to larger industrial belts in Ludhiana and Jalandhar means it experiences pollutant transport. The urban-rural gradient is pronounced; air quality deteriorates noticeably closer to the city centre due to concentrated emissions, while surrounding rural areas, though impacted by agricultural practices, initially benefit from greater dispersion. The flat topography limits natural ventilation, exacerbating pollution episodes, particularly during winter months when temperature inversions are common.

Sunām’s air quality follows a distinct seasonal pattern. The post-monsoon period, October-November, is typically the most polluted, driven by widespread agricultural stubble burning following the rice harvest. Calm winds and temperature inversions trap smoke close to the ground, creating hazardous conditions. December-January sees continued poor air quality, compounded by winter fog which further reduces dispersion. These are months to avoid strenuous outdoor activity, particularly for those with respiratory conditions. February-March brings gradual improvement as temperatures rise and winds pick up, dispersing pollutants. The monsoon season, July-September, offers the cleanest air, as rainfall effectively washes particulate matter from the atmosphere. However, increased humidity can also promote the formation of secondary pollutants. April-June experiences rising temperatures and dust storms, leading to increased particulate matter, though generally less severe than the winter months. Sensitive groups – children, the elderly, and those with pre-existing respiratory or cardiovascular illnesses – should exercise caution during peak pollution periods and consider using air purifiers indoors. Monitoring local conditions and heeding health advisories is crucial throughout the year.