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Tuensang, nestled in the eastern reaches of Nagaland, India, occupies a dramatically elevated position within the Patkai Range of the Eastern Himalayas. Located at approximately 26.27°N, 94.83°E and an elevation of around 1,500 meters (4,921 feet) above sea level, the city’s geography is defined by steep slopes, rugged terrain, and dense coniferous forests. This mountainous landscape significantly influences air circulation patterns; valleys can trap pollutants, while the surrounding hills act as barriers, limiting dispersal. Tuensang sits on the edge of a transitional zone between the subtropical Himalayan foothills and the higher-altitude temperate zones, impacting local climate and vegetation. The region is characterized by a predominantly rural landscape, with small-scale agriculture – primarily jhum (slash-and-burn) cultivation – dominating the surrounding areas. While Tuensang itself is a district headquarters and a commercial hub for the region, it lacks significant heavy industry. The urban–rural gradient is sharp, with the city surrounded by sparsely populated villages and extensive forest cover. The absence of major industrial belts nearby reduces direct industrial emissions, however, agricultural practices, particularly the burning of vegetation after harvest, can contribute to localized air pollution episodes. The proximity to Myanmar, though not directly impacting air quality in a significant way, highlights the region's sensitivity to broader environmental changes in Southeast Asia. The steep topography and limited flat land also constrain urban development, influencing building design and potentially impacting ventilation within the city.

Tuensang experiences a distinct seasonal cycle that profoundly impacts its air quality. The region is characterized by a wet and dry season, rather than the four traditional seasons. The dry season, typically spanning from November to April, is often associated with poorer air quality. During these months, reduced rainfall and lower temperatures contribute to atmospheric stability, fostering temperature inversions – a phenomenon where a layer of warm air traps cooler air near the ground, preventing pollutants from dispersing. The prevalent calm winds during this period exacerbate the problem, allowing particulate matter to accumulate. Agricultural practices, specifically the post-harvest burning of crop residue, are a significant contributor to pollution during this time. Fog, common in December and January, further restricts visibility and traps pollutants close to the ground. The monsoon season, from May to October, brings relief through frequent rainfall, which naturally cleanses the atmosphere. However, heavy rainfall can also lead to soil erosion and increased dust levels, temporarily impacting air quality. The increased humidity during the monsoon can also affect the respiratory system, making individuals more susceptible to infections. Sensitive groups, including children, the elderly, and those with pre-existing respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during periods of heavy fog or noticeable air stagnation. Maintaining indoor air quality through ventilation and air purification can also be beneficial. The transition periods, spring and autumn, generally offer the most favourable conditions for outdoor activities, with moderate temperatures and improved air circulation.