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Barwāh, nestled in the heart of Madhya Pradesh, India, at coordinates 22.2539°N, 76.0385°E, presents a unique geographic context influencing its air quality. The city sits on the Malwa Plateau, a region characterised by undulating terrain and black cotton soil, at an elevation of approximately 200 meters. This plateau landscape contributes to limited natural air dispersion. Barwāh is situated near the banks of the Kshipra River, a tributary of the Chambal, which, while providing a water source, can also contribute to localised humidity and potential temperature inversions, trapping pollutants. The surrounding landscape is a mix of agricultural land – primarily cotton, wheat, and soybean – and sparse deciduous forests. A gradual urban-rural gradient exists, with agricultural practices contributing to seasonal biomass burning. The city’s position isn’t directly within a major industrial belt, but regional industrial activity in nearby districts like Indore and Khargone does exert an influence. Road traffic, fuelled by Barwāh’s role as a regional trading centre, is a significant localised emission source. Dust from unpaved roads and construction activities further compounds the air quality challenges, particularly during the drier months. The relatively flat terrain hinders the effective flushing of pollutants by wind.

Barwāh experiences a distinct seasonal air quality pattern. The post-monsoon period, from October to November, often sees a deterioration in air quality due to the practice of crop residue burning following the harvest season. Calm winds and cooler temperatures contribute to pollutant accumulation. Winter, December to February, brings temperature inversions, trapping pollutants near the ground and exacerbating particulate matter concentrations. This is a period to avoid strenuous outdoor activity, especially for those with respiratory conditions. The pre-monsoon months, March to May, are characterised by rising temperatures and dust storms, leading to increased levels of coarse particulate matter. May is typically the worst month. The arrival of the monsoon in June-September brings a significant improvement in air quality as rainfall washes away pollutants and increased humidity suppresses dust. However, increased cloud cover can also lead to reduced sunlight and potential for photochemical smog formation. September sees a gradual return to drier conditions and a slight increase in pollutants. Sensitive groups – children, the elderly, and those with pre-existing respiratory or cardiovascular illnesses – should exercise caution during the post-monsoon and winter months, limiting outdoor exposure and using appropriate respiratory protection.