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Upleta, nestled in the Surendranagar district of Gujarat, India (21.7300° N, 70.2800° E), occupies a geographically significant position within the Thar Desert's periphery. The city’s terrain is predominantly flat, characteristic of the Gujarat plains, with an average elevation of approximately 65 meters above sea level. This low elevation, combined with the surrounding arid landscape of sand dunes and scrubland, contributes to a unique microclimate that can exacerbate air quality challenges. Upleta’s location is crucial; it lies within a region experiencing a gradual urban–rural gradient, transitioning from agricultural fields – primarily cotton and pulses – to more sparsely populated desert areas. The proximity to the industrial belt of Ahmedabad, roughly 150 kilometers to the northeast, introduces a source of regional pollution transported by prevailing winds. The lack of significant natural barriers, such as hills or dense forests, allows pollutants to disperse less effectively. The city’s limited access to large bodies of water – the nearest substantial river being the Bhogavo – further restricts natural air purification processes. The surrounding landscape, largely dominated by agricultural practices and occasional small-scale industries, influences the types of pollutants present, with dust, agricultural residue burning, and industrial emissions all playing a role. The flat topography and arid climate create conditions where dust storms are common, significantly impacting particulate matter levels. The urban character of Upleta is developing, with a mix of traditional housing and newer constructions, impacting local wind patterns and potentially trapping pollutants.

Upleta’s air quality experiences a distinct seasonal cycle heavily influenced by the region’s climate. The dry season, spanning roughly October to May, is generally characterized by lower humidity and increased wind speeds, which can initially aid in pollutant dispersion. However, this period also witnesses a surge in agricultural residue burning following the harvest of crops like cotton, significantly elevating particulate matter concentrations. November and December often see the worst air quality due to a combination of cooler temperatures and stagnant air conditions, occasionally leading to temperature inversions that trap pollutants near the ground. January and February are typically drier, but dust storms, common in this region, can dramatically worsen air quality. The monsoon season, from June to September, brings relief with increased rainfall, which naturally washes pollutants from the atmosphere. However, the onset of the monsoon can be accompanied by periods of heavy fog, particularly in the mornings, which traps pollutants and reduces visibility. The humidity increases, which can exacerbate respiratory issues. During the summer months (April-May), high temperatures and dry winds contribute to increased ozone formation, although this is generally less impactful than particulate matter pollution. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should limit outdoor activity during the dry season, particularly during periods of agricultural burning and fog. Staying indoors with air purifiers and wearing masks can offer some protection. The monsoon months offer a respite, but vigilance is still advised during foggy mornings.