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Vetapālem, a municipality in Andhra Pradesh, India, occupies a relatively flat coastal plain at approximately 15.78°N, 80.32°E. Its elevation is low, characteristic of the Krishna Delta region, influencing air dispersion patterns. The city is situated inland from the Bay of Bengal, approximately 15-20 kilometers from the coast, meaning it experiences a maritime-influenced climate but isn’t directly exposed to strong sea breezes that could rapidly flush out pollutants. The surrounding landscape is dominated by intensely cultivated agricultural land, primarily paddy fields, with pockets of mangrove forests closer to the coast. This agricultural intensity contributes to seasonal biomass burning and ammonia emissions. The urban-rural gradient is fairly sharp; Vetapālem is a concentrated urban centre surrounded by rural agricultural areas. To the west and northwest lie areas with increasing industrial activity related to food processing and aquaculture. This proximity to both agricultural and nascent industrial zones creates a complex pollution profile. The terrain’s flatness limits natural ventilation, exacerbating pollutant build-up, particularly during calm weather conditions. The Krishna River, a vital waterway, flows nearby, but its influence on local air quality is indirect, primarily through irrigation supporting agricultural emissions.

Vetapālem’s air quality follows a distinct wet-dry seasonal pattern dictated by the Indian monsoon. The pre-monsoon months of April and May see peak pollution levels. High temperatures and stagnant air create ideal conditions for dust suspension and the build-up of pollutants from agricultural activities and local industries. The arrival of the southwest monsoon in June brings a significant improvement, as rainfall washes away particulate matter and increased humidity suppresses dust. However, the monsoon also increases humidity, potentially fostering fungal growth and related allergens. Post-monsoon, from September to November, air quality remains relatively good, though localised burning of agricultural residue after the harvest can cause temporary spikes. The winter months, December to February, often experience temperature inversions, trapping pollutants near the ground, especially in the early mornings. This is a period of concern for respiratory health. March sees a gradual deterioration as temperatures rise and pre-monsoon conditions return. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor activity during April-May and December-February, and consider using air purifiers indoors.