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Sūjāngarh, nestled within the arid landscape of Rajasthan, India, presents a unique geographic context influencing its air quality. Located at 27.7000°N, 74.4700°E, the city sits on relatively flat terrain, part of the broader Marwar region. Its elevation is modest, contributing to limited natural dispersion of pollutants. The surrounding landscape is predominantly semi-arid, characterized by scrubland and agricultural fields, particularly rain-fed crops. Sūjāngarh isn’t proximate to any major bodies of water; the nearest significant water source is some distance away, meaning limited evaporative cooling. The urban-rural gradient is fairly sharp, with agricultural activity dominating the periphery. While not a major industrial hub itself, Sūjāngarh’s regional position means it’s affected by industrial emissions from larger centres within Rajasthan. Dust storms are a frequent occurrence, originating from the Thar Desert to the west and northwest, significantly impacting particulate matter levels. The city’s layout, typical of many Indian towns, features a dense core with narrower streets, hindering airflow and exacerbating localised pollution. Road dust resuspension from unpaved roads and construction activities further contributes to the particulate load. The lack of substantial green cover limits the natural filtration of airborne pollutants, making Sūjāngarh particularly vulnerable to poor air quality.

Sūjāngarh experiences a pronounced seasonal air quality narrative dictated by its arid climate. Summer (April-June) brings scorching temperatures and strong winds, initially dispersing pollutants, but also increasing dust storm frequency, leading to high particulate matter. This is a period to avoid strenuous outdoor activity. The monsoon season (July-September) offers temporary relief, with rainfall scavenging pollutants from the air. However, increased humidity can trap pollutants closer to the ground. October-November sees a deterioration in air quality as temperatures drop and wind speeds decrease, creating conditions for temperature inversions that trap pollutants. This is often the worst period for air quality. Winter (December-February) is characterised by cool temperatures, calm winds, and frequent fog, exacerbating pollution levels, particularly from biomass burning for heating. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor exposure during these months. Spring (March) sees a gradual warming and increasing wind speeds, offering some improvement, but dust levels remain a concern. Overall, the monsoon months offer the most favourable conditions for outdoor activity, while late autumn and winter demand heightened precautions.