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Hanūr, a small town in Karnataka, India, rests at coordinates 12.0874°N, 77.3021°E, nestled within the undulating terrain of the Deccan Plateau. With a population of approximately 12,213, Hanūr’s geography significantly influences its air quality. The town is situated in a predominantly rural landscape, characterized by agricultural lands – primarily paddy and sugarcane – and interspersed with small hills. This agricultural focus introduces potential sources of particulate matter from farming activities like harvesting and biomass burning. The surrounding landscape is relatively flat, lacking significant topographical features to promote air dispersion. The nearest major water body is the Kapila River, which, while providing some localized humidity, doesn’t exert a strong influence on regional wind patterns. Hanūr isn’t directly within a major industrial belt, but its proximity to larger towns like Mysore means it experiences some indirect impacts from regional industrial emissions. The urban-rural gradient is pronounced; Hanūr itself is a relatively low-density settlement, but increasing connectivity is leading to greater vehicular traffic. This combination of agricultural practices, limited natural ventilation, and growing transport contributes to localized air quality challenges. The elevation, around 770 meters, plays a minor role, potentially contributing to temperature inversions during calmer periods.

Hanūr experiences a tropical climate with distinct wet and dry seasons, profoundly impacting air quality. The dry season, roughly November to May, sees consistently poorer air quality. January and February are particularly challenging, with cooler temperatures leading to increased use of solid fuels for heating and stable atmospheric conditions trapping pollutants. Dust from agricultural activities and road traffic also accumulates. The pre-monsoon months of April and May bring increased temperatures and wind speeds, offering temporary relief, but also potential for dust storms. The arrival of the southwest monsoon in June marks a significant improvement. Heavy rainfall effectively washes away particulate matter, and increased humidity suppresses dust. However, increased cloud cover can lead to temperature inversions, trapping pollutants near the ground. Post-monsoon (September-October) sees a gradual deterioration as rainfall decreases and agricultural burning intensifies. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the dry season, particularly January-February and April-May. During the monsoon and immediately after, air quality is generally favourable for outdoor activities. Monitoring local weather patterns is crucial, as calm conditions can quickly negate the benefits of rainfall.