Kāranchedu, a small town in the Prakasam district of Andhra Pradesh, India, sits at coordinates 15.8823°N, 80.3170°E. The terrain is largely flat, characteristic of the Krishna-Godavari Delta region, though subtle undulations are present. The town’s elevation is relatively low, contributing to limited atmospheric dispersion of pollutants. Kāranchedu is not directly adjacent to a major body of water, though it lies within the broader coastal plain influenced by the Bay of Bengal. This proximity introduces humidity and potential for sea breezes, but also the risk of saline intrusion into groundwater. The surrounding landscape is predominantly agricultural, with significant rice cultivation and increasingly, horticulture. However, Kāranchedu is also experiencing industrial growth, particularly in the pharmaceutical and agrochemical sectors, creating localised pollution hotspots. The urban-rural gradient is sharp; the town itself is compact, quickly giving way to agricultural fields. This concentrated industrial activity, combined with agricultural practices like crop residue burning, and the flat topography, significantly impacts local air quality. Dust from unpaved roads and construction further exacerbates particulate matter concentrations. The town’s position within a relatively stagnant air mass during certain times of the year limits the natural flushing of pollutants.

Kāranchedu experiences a tropical climate, with air quality fluctuating dramatically between the wet and dry seasons. The dry season, from November to May, sees consistently poorer air quality. Lower humidity and stagnant air allow pollutants from industrial sources and agricultural burning to accumulate. January to March are particularly challenging, with temperature inversions trapping pollutants near the ground. The monsoon season, from June to October, brings significant relief. Heavy rainfall effectively washes particulate matter from the atmosphere, and increased wind speeds aid dispersion. However, even during the monsoon, localised pollution can occur due to increased traffic congestion from waterlogged roads and continued industrial activity. Post-monsoon, in November, a brief period of moderate air quality is often observed before the dry season returns. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the peak dry season months. During the monsoon, while overall air quality improves, caution is advised regarding waterborne diseases and potential mould growth indoors. Monitoring wind direction is crucial; winds from industrial areas will carry higher pollutant loads.