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Baheri, a small town nestled in the Arrah district of Bihar, India (25.9426° N, 86.0471° E), occupies a geographically significant position within the fertile plains of the Indo-Gangetic Basin. The terrain is predominantly flat, characteristic of the alluvial soil deposits left by the Ganges River and its tributaries. This flatness, while conducive to agriculture, unfortunately limits natural air dispersion, a crucial factor in air quality. Baheri sits within a predominantly rural landscape, surrounded by agricultural fields – primarily rice and wheat cultivation – which contribute to seasonal biomass burning. The town’s proximity to the Ganges River, though providing a vital water source, can also influence local weather patterns, occasionally leading to humidity and fog, which trap pollutants. While not directly adjacent to a major industrial belt, Baheri’s location within Bihar places it within reach of industrial activity concentrated in larger cities like Patna and Dhanbad, with associated transport-related emissions impacting air quality. The urban-rural gradient around Baheri is gradual; the town itself exhibits a modest urban character with local markets and residential areas, transitioning quickly into agricultural land. Elevation is low, typically below 100 meters above sea level, further hindering vertical air mixing and exacerbating the potential for pollutant accumulation. The surrounding landscape, largely agricultural, means that seasonal agricultural practices, particularly post-harvest burning, significantly influence the local air quality profile.

Baheri’s air quality experiences a distinct seasonal cycle dictated by the region’s monsoon climate. The dry season, spanning roughly October to May, presents the most challenging period. During these months, lower humidity and reduced rainfall contribute to a stable atmospheric boundary layer, often leading to temperature inversions, particularly in November and December. These inversions trap pollutants near the ground, intensifying their impact. Agricultural burning, a common practice after the harvest of rice and wheat, releases significant quantities of particulate matter and other pollutants, peaking in November and April. The winter months (December-February) are often characterized by dense fog, further restricting visibility and trapping pollutants. The monsoon season (June-September) brings relief, with increased rainfall and stronger winds dispersing pollutants. However, the monsoon can also introduce moisture and humidity, which, combined with stagnant air conditions during periods of low wind speed, can occasionally lead to localized pollution episodes. The transitional periods (March-May and September-October) are marked by variable conditions, with increasing temperatures and wind speeds in the spring and gradually increasing humidity in the autumn. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of agricultural burning and fog. Outdoor activities are generally best avoided during peak pollution episodes, and the use of air purifiers and masks is recommended.