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Malkanūr, a small town in the Krishna district of Andhra Pradesh, India, sits at coordinates 18.0821°N, 79.3628°E. The terrain is largely flat, characteristic of the Krishna River delta, with an elevation hovering around 25 meters above sea level. This low-lying position contributes to limited natural air dispersion. The town is situated approximately 20km inland from the Bay of Bengal, meaning humidity is consistently high, and coastal breezes offer intermittent, though often insufficient, relief from stagnant air. Surrounding Malkanūr is a predominantly agricultural landscape, heavily focused on rice cultivation, with smaller pockets of sugarcane and other crops. While not a major industrial hub itself, Malkanūr is within reach of larger industrial areas along the coast, particularly around Vijayawada and Visakhapatnam, meaning long-range transport of pollutants is a factor. The urban-rural gradient is sharp; the town represents a concentrated point of activity within a largely agrarian setting. Dust from agricultural practices, particularly during harvesting and land preparation, is a significant local source of particulate matter. The Krishna River itself, while vital for irrigation, can also contribute to localised humidity and potential for stagnant air conditions, trapping pollutants. The town’s relatively small size means emissions are concentrated, exacerbating local air quality issues.

Malkanūr experiences a tropical climate with distinct wet and dry seasons heavily influencing air quality. The post-monsoon period (October-November) often sees a temporary improvement as rainfall washes away accumulated pollutants, but this is short-lived. The dry season (December-May) is typically the most challenging period. Lower wind speeds and increased temperatures lead to greater ground-level ozone formation, and agricultural burning for land preparation after the harvest contributes significantly to particulate matter. January and February are often marked by temperature inversions, trapping pollutants near the ground. The pre-monsoon months (April-May) are particularly harsh, with dust storms and high temperatures exacerbating respiratory issues. The southwest monsoon (June-September) brings substantial rainfall, effectively cleansing the air, though increased humidity can foster mold growth indoors. October sees a transition, with decreasing rainfall and rising temperatures. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor activity during the dry season, particularly April-May. During the monsoon, while air quality improves, precautions against waterborne diseases are crucial. Monitoring local weather patterns is key to anticipating pollution spikes.