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Khatīma, nestled in the terai belt of Uttarakhand, India, presents a unique geographic context influencing its air quality. Situated at coordinates 28.9198°N, 79.9699°E, the city lies at a relatively low elevation for the region, approximately 245 meters above sea level. This position within the plains, bordering Nepal, contrasts sharply with the Himalayan foothills to the north. The surrounding landscape is predominantly agricultural, characterized by fertile land dedicated to sugarcane, rice, and wheat cultivation. The Kosi River flows nearby, impacting local humidity and potentially contributing to localized fog formation during cooler months. Khatīma’s urban character is rapidly evolving, transitioning from a primarily agricultural town to a more diversified urban center with increasing vehicular traffic and small-scale industrial activity. The urban-rural gradient is pronounced, with surrounding villages relying heavily on biomass burning for cooking and heating. This, combined with dust from agricultural practices and road construction, significantly impacts air quality. The terai region’s flat terrain limits natural air dispersion, exacerbating pollution episodes, particularly during periods of calm weather. The proximity to the densely populated Indo-Gangetic Plain also means Khatīma can be affected by long-range transport of pollutants.

Khatīma experiences a distinct seasonal air quality pattern. The winter months (November to February) are typically the most polluted. Cool temperatures lead to temperature inversions, trapping pollutants near the ground. Increased biomass burning for warmth and fog formation further degrade air quality. Outdoor activity should be minimized during these months, especially for individuals with respiratory conditions. The pre-monsoon season (March to May) sees rising temperatures and dust storms, elevating particulate matter levels. April and May are particularly challenging. The arrival of the monsoon (June to September) brings a temporary respite, as rainfall washes away pollutants and increased humidity suppresses dust. However, increased cloud cover can also trap pollutants at lower altitudes. October offers the cleanest air, with post-monsoon winds dispersing pollutants. Sensitive groups – children, the elderly, and those with pre-existing respiratory or cardiovascular diseases – should be particularly cautious during the winter and pre-monsoon seasons. Monitoring local weather patterns and avoiding strenuous outdoor activity on high-pollution days is crucial. The monsoon, while offering relief, can also bring dampness that exacerbates respiratory issues for some.