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Khunti Dhanaili, nestled in the state of Bihar, India, occupies a geographically significant position within the Chota Nagpur Plateau region. Located at approximately 25.9376° latitude and 87.3790° longitude, the town’s elevation contributes to a generally undulating terrain, typical of the plateau landscape. The surrounding area is characterized by a mix of dense forests, agricultural lands, and scattered rural settlements, creating a distinct urban–rural gradient. While not directly adjacent to major rivers, the region receives substantial rainfall during the monsoon season, influencing local humidity and atmospheric conditions. Khunti Dhanaili’s proximity to the industrial belt of Jharkhand, though not immediately bordering it, means that pollutants can be transported via prevailing winds, particularly during drier periods. The dominant land use is a combination of small-scale agriculture – primarily rice and maize cultivation – and forestry, with limited industrial activity within the town itself. This agricultural activity, coupled with biomass burning during the post-monsoon season, can contribute to localized air pollution. The plateau’s topography can also trap pollutants, especially during periods of temperature inversion, hindering dispersion. The town’s relatively small population (16,304) suggests a primarily rural character, with limited vehicular traffic compared to larger urban centers, although this is gradually changing with improved road connectivity. The surrounding landscape, a mosaic of forests and farmland, plays a crucial role in the regional air quality, acting as both a source and a potential sink for pollutants.

Khunti Dhanaili’s air quality experiences a distinct seasonal cycle heavily influenced by the Indian monsoon and regional weather patterns. The monsoon season (roughly June to September) brings relief from accumulated pollutants, with frequent rainfall effectively scrubbing the atmosphere. However, the preceding pre-monsoon period (March to May) often witnesses a significant deterioration in air quality. High temperatures, low humidity, and stagnant air conditions, frequently accompanied by fog, create a conducive environment for pollutant accumulation. Agricultural burning, a common practice after the harvest, further exacerbates the situation, releasing particulate matter and other harmful gases. The post-monsoon season (October to November) presents a transitional period. While rainfall decreases, the lingering effects of agricultural burning continue to impact air quality, often resulting in hazy conditions. Winter months (December to February) are typically characterized by cooler temperatures and frequent fog, which traps pollutants near the ground, leading to periods of reduced visibility and potentially elevated concentrations of fine particulate matter. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon and post-monsoon seasons, limiting outdoor activities during peak pollution episodes. During the monsoon, while overall air quality improves, heavy rainfall can still lead to localized flooding and associated waterborne illnesses. Maintaining indoor air quality through proper ventilation and air filtration is advisable throughout the year, particularly during periods of elevated pollution.