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Rangāpāra, nestled in the Udalguri district of Assam, India, occupies a geographically significant position within the Brahmaputra Valley. Located at approximately 26.84° N latitude and 92.67° E longitude, the town sits at a modest elevation of around 125 meters (410 feet) above sea level. The surrounding landscape is characterized by a mix of undulating hills, fertile plains, and dense tropical forests, typical of the Assam region. The town’s proximity to the Dhansiri River, a tributary of the Brahmaputra, influences local microclimates and contributes to humidity levels. Rangāpāra’s urban character is that of a developing town, transitioning from a primarily rural setting. The urban–rural gradient is relatively sharp, with agricultural lands dominating the immediate periphery. The region is part of a broader agricultural belt, with rice cultivation being the dominant activity, alongside tea plantations and other crops. While Rangāpāra itself doesn't host major heavy industries, it serves as a trading hub for the surrounding agricultural areas, and the potential for increased transportation-related emissions is a growing concern. The valley’s topography, with its enclosed nature, can sometimes exacerbate air pollution episodes, particularly during periods of stagnant air. The prevailing winds, often influenced by the monsoon patterns, play a crucial role in dispersing pollutants, but their effectiveness is limited during certain times of the year. The dense vegetation surrounding the town generally acts as a natural filter, but its capacity is tested during periods of high pollution.

Rangāpāra’s air quality experiences a distinct seasonal cycle dictated by the region’s monsoonal climate. The monsoon season, typically spanning from June to September, brings heavy rainfall and strong winds, which generally flush out pollutants, leading to improved air quality. However, periods of intense rainfall can also lead to localised flooding and the release of organic compounds, potentially impacting air quality temporarily. The pre-monsoon months (March-May) often see a build-up of pollutants due to increased agricultural burning, preparing fields for the planting season. This, combined with rising temperatures and decreasing wind speeds, can create conditions conducive to stagnant air and elevated particulate matter. The post-monsoon season (October-November) is often characterised by cooler temperatures and calmer winds, which can trap pollutants near the ground, particularly during foggy mornings. December and January are typically the coldest months, with frequent fog formation, which significantly reduces visibility and concentrates pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon and post-monsoon periods, limiting outdoor activities during peak pollution hours. Agricultural workers are particularly vulnerable during the burning season and should utilise appropriate respiratory protection. The humid climate throughout the year can exacerbate respiratory issues, making it crucial to stay hydrated and avoid prolonged exposure to polluted air. While the monsoon offers a respite, awareness of agricultural practices and their impact remains vital for maintaining air quality.