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Tanakpur, nestled in the foothills of the Kumaon Himalayas in Uttarakhand, India, occupies a unique geographic position at 29.0740°N, 80.1090°E and an elevation of approximately 286 meters (938 feet). The city is strategically located on the banks of the Sharda River, a major tributary of the Ghaghara River, bordering Nepal. This proximity to the river influences local humidity and can contribute to temperature inversions, trapping pollutants. The surrounding landscape is dominated by dense subtropical forests transitioning into higher-altitude Himalayan ecosystems. Tanakpur serves as a crucial transit point for pilgrims travelling to the Purnagiri Temple and other religious sites in the region, leading to increased vehicular traffic. While not heavily industrialized itself, Tanakpur’s position along key transport routes means it experiences pollution from passing vehicles. The surrounding areas are largely agricultural, with terraced farming common on the lower slopes. The urban-rural gradient is quite sharp; the city core is relatively compact, quickly giving way to rural landscapes. This rapid transition, combined with the valley topography, can exacerbate localized air pollution events, particularly during calm weather conditions. The terrain funnels air masses, potentially concentrating pollutants. The city’s location within a river valley also means it’s susceptible to moisture accumulation, influencing particulate matter concentrations.

Tanakpur’s air quality follows a distinct seasonal pattern. The winter months (November to February) typically experience the poorest air quality. Cool temperatures and frequent temperature inversions trap pollutants near the ground, exacerbated by increased use of solid fuels for heating. Fog, common during this period, further reduces dispersion. March and April bring a slight improvement as temperatures rise, but dust from agricultural activities and construction can elevate particulate matter. The pre-monsoon season (May-June) sees increasing temperatures and dry conditions, potentially leading to dust storms and localized burning of agricultural residue, worsening air quality. The monsoon season (July-September) generally offers the cleanest air, as rainfall effectively washes away pollutants. However, increased humidity can also promote the formation of secondary pollutants. October witnesses a transition period, with decreasing rainfall and a gradual build-up of pollutants. For individuals with respiratory conditions, avoiding outdoor activity during winter mornings and pre-monsoon months is advisable. Sensitive groups, including children and the elderly, should limit prolonged exposure during periods of stagnant air. Monitoring local conditions and using appropriate respiratory protection when necessary is crucial. The monsoon provides the most favourable conditions for outdoor activities.