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Nestled in the foothills of the Shivalik range within Uttarakhand, India, Vikāsnagar occupies a geographically significant position, approximately 22 kilometers north-west of Dehradun. Its coordinates (30.4680, 77.7740) place it at an elevation of roughly 450 meters above sea level, contributing to a relatively mild climate. The surrounding landscape is characterized by undulating hills covered in a mix of dense forests, agricultural fields, and scattered settlements, creating a distinct urban–rural gradient. Vikāsnagar itself is a small town, exhibiting a planned urban layout, a legacy of its development during the British Raj as a cantonment town. The proximity to the Yamuna River, though not directly adjacent, influences regional weather patterns and contributes to humidity levels. The town’s location within the broader Doon Valley, a fertile plain bounded by the Himalayas, means it’s susceptible to pollutants transported from industrial areas further east and agricultural burning prevalent in the surrounding plains during harvest seasons. The terrain, with its slopes and valleys, can also trap pollutants, particularly during periods of low wind speed. While Vikāsnagar itself has limited heavy industry, its connection to Dehradun and the wider industrial belt of Haridwar means it experiences secondary pollution impacts. The dominant land use is a combination of residential areas, small-scale commercial establishments, and agricultural land, with forestry playing a crucial role in the surrounding ecosystem and influencing local air quality through natural filtration.

Vikāsnagar’s air quality follows a distinct seasonal pattern dictated by the interplay of meteorological factors and regional activities. The post-monsoon season (October-November) typically witnesses the poorest air quality. Following the monsoon rains, agricultural residue burning becomes widespread in the plains to the east, sending plumes of smoke drifting westward, frequently impacting Vikāsnagar. Temperature inversions, common during these cooler months, trap pollutants close to the ground, exacerbating the situation. Winter (December-February) brings colder temperatures and often dense fog, further reducing air dispersion and contributing to stagnant air conditions. Spring (March-May) sees a gradual improvement as temperatures rise, winds increase, and agricultural burning decreases. The monsoon season (June-September) brings relief, with frequent rainfall washing away pollutants and strong winds dispersing them. However, heavy rainfall can also lead to increased humidity and the release of biogenic volatile organic compounds (BVOCs) from vegetation, which can contribute to ozone formation under certain conditions. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the post-monsoon and winter months, limiting outdoor exertion and monitoring for respiratory discomfort. The increased prevalence of dust during the dry season also warrants precautions. Outdoor activities are generally more favourable during the monsoon and spring seasons, although vigilance regarding pollen counts during spring is advisable.