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Visnagar, a city in the Mehsana district of Gujarat, India, sits at coordinates 23.7000°N, 72.5500°E, within the broader Indo-Gangetic Plain. The terrain is largely flat, typical of the region, with an average elevation around 88 meters. This relatively low-lying position contributes to the potential for pollutant accumulation, particularly during periods of stagnant air. Visnagar is not directly adjacent to a major body of water, though the Banaskantha Canal system provides some localised irrigation. The surrounding landscape is predominantly agricultural, with significant cotton and cumin cultivation, alongside increasingly visible industrial activity related to textiles and pharmaceuticals. The city functions as a regional trading hub for agricultural produce, attracting vehicular traffic. The urban-rural gradient is fairly sharp; Visnagar is a concentrated urban centre surrounded by extensive farmland. This proximity means agricultural practices, including seasonal crop burning, can directly impact local air quality. Dust from agricultural lands, combined with construction activities within the growing city, forms a significant component of particulate matter. The city’s location within Gujarat, a state experiencing rapid industrialisation, further exacerbates pollution pressures. The lack of significant natural barriers to wind flow means pollutants can be readily transported both into and out of the city, depending on prevailing weather patterns.

Visnagar experiences a distinct seasonal air quality pattern dictated by the monsoon and post-monsoon periods. The summer months (March to May) see consistently poor air quality due to high temperatures, low wind speeds, and dust storms originating from the arid regions to the west. Construction activity also peaks during this time, adding to particulate matter. The arrival of the monsoon in June brings temporary relief, as rainfall washes away pollutants and increases humidity, suppressing dust. However, increased traffic congestion due to waterlogged roads can offset some of these benefits. Post-monsoon (September-November) often sees a resurgence of pollution, linked to crop residue burning in surrounding agricultural areas following the harvest. This is a particularly challenging period. Winter (December-February) brings cooler temperatures and the potential for temperature inversions, trapping pollutants near the ground. Fog can also exacerbate the problem, reducing visibility and increasing pollutant concentrations. For sensitive groups – children, the elderly, and those with respiratory conditions – avoiding outdoor activity during summer afternoons and post-monsoon evenings is advisable. The monsoon season generally offers the best air quality, though vigilance regarding localised flooding and associated traffic is still needed.