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Mokokchung, nestled in the foothills of the Eastern Himalayas in Nagaland, India, occupies a unique geographic position significantly influencing its air quality. Located at approximately 26.32°N, 94.50°E and an elevation of around 1,360 meters (4,462 feet) above sea level, the city experiences a temperate climate shaped by its mountainous terrain. The surrounding landscape is dominated by dense forests, primarily comprising subtropical evergreen and semi-evergreen types, interspersed with agricultural patches. Mokokchung sits within a region characterized by a gradual urban–rural gradient; while the city itself is a significant urban center for Nagaland, it’s surrounded by smaller villages and agricultural lands, primarily cultivating rice and maize. This proximity to agricultural zones introduces potential sources of particulate matter, particularly during harvest seasons when burning of crop residue can occur. The terrain, with its steep slopes and valleys, can contribute to localized air stagnation, especially during periods of calm weather. While Mokokchung lacks direct proximity to major rivers or lakes, the region receives substantial rainfall, which generally helps to cleanse the atmosphere. The absence of large-scale industrial belts within immediate proximity is a mitigating factor, however, transportation-related emissions from vehicles and occasional burning for land clearing remain key considerations for air quality management. The city’s location within a rain shadow area, relative to the monsoon winds, can also influence atmospheric moisture and pollutant dispersion.

Mokokchung’s air quality follows a distinct seasonal pattern dictated by its subtropical climate and monsoon influence. The monsoon season, typically spanning June to September, brings frequent rainfall, which naturally acts as a significant air purifier, flushing out pollutants and generally resulting in improved air quality. However, periods of prolonged rainfall can lead to damp conditions and increased humidity, potentially exacerbating respiratory issues for sensitive individuals. The pre-monsoon months (March-May) often see a gradual increase in particulate matter as agricultural activities intensify, and the burning of vegetation for land preparation becomes more prevalent. This period can be characterized by stagnant air and localized fog, trapping pollutants near the ground. The post-monsoon season (October-November) is generally pleasant with clear skies, but can experience occasional temperature inversions, particularly in the early morning hours, which can trap pollutants and lead to temporary air quality degradation. Winter (December-February) is typically the driest period, with cooler temperatures and less rainfall. While the lack of rain might seem beneficial, the combination of cooler temperatures and calmer winds can lead to pollutant accumulation, especially if there are localized sources of emissions. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the pre-monsoon and winter months, limiting prolonged outdoor exposure and taking necessary precautions to protect their respiratory health. Periods of fog should be avoided entirely due to the increased concentration of pollutants at ground level.