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Nirāla, nestled in the state of Maharashtra, India, occupies a geographically significant position within the Deccan Plateau. Located at approximately 19.8143° N latitude and 78.1662° E longitude, the city’s terrain is predominantly undulating, characteristic of the plateau’s landscape. Nirāla sits at a modest elevation, contributing to a relatively moderate climate, but also influencing local air circulation patterns. The surrounding landscape is a blend of agricultural fields – primarily cultivating sugarcane, cotton, and pulses – and pockets of dry deciduous forest, typical of the region. This proximity to agricultural zones introduces potential sources of particulate matter, particularly during harvest seasons when burning of crop residue can occur. To the east, the city gradually transitions into a rural gradient, with scattered villages and smaller agricultural holdings. Further west, the landscape becomes slightly more elevated, potentially impacting wind patterns and pollutant dispersion. Nirāla’s location isn’t directly adjacent to major rivers or large bodies of water, which would typically aid in pollutant dispersal through precipitation and increased humidity. However, the intermittent streams and seasonal water bodies within the surrounding agricultural lands can influence local microclimates. While not situated directly within a major industrial belt, Nirāla’s connectivity to larger urban centres in Maharashtra means it can be affected by transboundary pollution. The urban character is developing, with a mix of traditional housing and newer constructions, impacting urban heat island effects and potentially influencing local air quality.

Nirāla’s air quality experiences a distinct seasonal cycle dictated by the region’s monsoon climate. The dry season, typically spanning from March to May, presents the most challenging period. With minimal rainfall and consistently high temperatures, atmospheric stability increases, often leading to temperature inversions – a phenomenon where cooler air is trapped beneath a layer of warmer air, preventing pollutants from dispersing vertically. This stagnation, coupled with agricultural burning practices in the surrounding rural areas, results in elevated particulate matter concentrations. The months of April and May are particularly concerning for outdoor activity. Conversely, the monsoon season, from June to September, brings significant relief. Frequent rainfall effectively ‘washes’ pollutants from the atmosphere, and increased wind speeds facilitate dispersion. Humidity also rises, which can slightly reduce the impact of particulate matter on respiratory systems. The transitional periods – October-November (post-monsoon) and December-February (winter) – exhibit varying conditions. Post-monsoon can see a brief resurgence of pollutants as agricultural activities resume, while winter often brings cooler temperatures and occasional fog, which can trap pollutants near the ground. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season, limiting prolonged outdoor exposure and monitoring local air quality information. During the monsoon, while generally cleaner, heavy rainfall can still lead to localised flooding and associated air quality concerns from stagnant water and mould growth.