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Vanthli, nestled in the Surendranagar district of Gujarat, India (21.4778° N, 70.3306° 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. Vanthli sits within a region heavily influenced by agricultural practices, particularly cotton farming, which introduces particulate matter from tilling and harvesting activities. To the east, the industrial belt of Surendranagar, with its textile mills and chemical processing units, represents a potential source of pollutants carried by prevailing winds. The urban–rural gradient around Vanthli is relatively sharp; the city transitions quickly into agricultural fields and sparsely populated villages. The lack of significant bodies of water nearby—the nearest substantial river being the Bhogavo—limits natural air purification processes. The surrounding landscape, largely devoid of dense vegetation, offers minimal buffering against dust storms and windblown sand, further impacting air quality. The city’s location within a semi-arid climate zone means that evaporation rates are high, and the dry air readily carries particulate matter, making it susceptible to dust and pollution accumulation.

Vanthli’s air quality follows a distinct seasonal pattern dictated by the region’s climate. The dry, hot months of March to May present the most challenging period. High temperatures and minimal rainfall create stable atmospheric conditions, often leading to temperature inversions where cooler air is trapped near the ground, preventing pollutants from dispersing. This, coupled with agricultural activities like pre-monsoon cotton harvesting, significantly increases particulate matter concentrations. The monsoon season, typically from June to September, brings a welcome respite. Increased rainfall effectively washes pollutants from the atmosphere, and stronger winds aid in dispersion. However, monsoon winds can also carry moisture and humidity, potentially impacting respiratory health for some individuals. October and November see a gradual return to drier conditions, with a resurgence of dust and agricultural emissions. Winter months (December to February) are generally cooler, but fog formation, particularly in the early mornings, traps pollutants close to the ground, creating localized pockets of poor air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon and winter months, limiting outdoor exertion during peak pollution periods. Staying indoors with air purifiers and wearing masks when venturing outside are recommended strategies. The agricultural cycle and industrial activity patterns are key drivers of seasonal air quality fluctuations in Vanthli, demanding proactive mitigation measures.