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Bhīmavaram, nestled in the West Godavari district of Andhra Pradesh, India, is a coastal city geographically defined by its proximity to the Bay of Bengal. Located at 16.5430°N, 81.5230°E, the city sits within the fertile Krishna Delta, a low-lying alluvial plain formed by the Krishna River. The terrain is predominantly flat, with an elevation barely above sea level, making it susceptible to tidal influences and seasonal flooding. This deltaic environment supports intensive agricultural practices, primarily rice cultivation, which contributes to localised air quality concerns through biomass burning and fertilizer use. Bhīmavaram’s urban character is evolving, transitioning from a primarily agricultural market town to a more diversified economy with emerging industrial activity, particularly related to fish processing and aquaculture. The surrounding landscape is a mosaic of paddy fields, coconut groves, and mangrove vegetation along the coastline. The urban-rural gradient is relatively sharp, with agricultural lands immediately bordering the city limits. The coastal location means the city is frequently exposed to sea breezes, which can both disperse and transport pollutants. The lack of significant topographical barriers allows for relatively easy pollutant dispersion, but also makes it vulnerable to long-range transport of pollutants from other industrial areas along the Andhra Pradesh coast.

Bhīmavaram experiences a tropical climate, with air quality fluctuating significantly between the wet and dry seasons. The post-monsoon and winter months (October to February) typically exhibit the poorest air quality. Lower temperatures during this period create temperature inversions, trapping pollutants near the ground. Reduced wind speeds also limit dispersion. Agricultural residue burning after the harvest season further exacerbates particulate matter concentrations. The monsoon season (June to September) brings relief, with heavy rainfall effectively washing away pollutants and increasing humidity, suppressing dust. However, increased humidity can also promote the formation of mold and allergens. The hot, dry summer months (March to May) see a moderate increase in dust and ozone levels due to high temperatures and intense sunlight. Sea breezes offer some respite, but can also carry salt particles which contribute to respiratory irritation. For sensitive groups – children, the elderly, and those with respiratory conditions – avoiding outdoor activity during the post-monsoon season is advisable. Monitoring local weather patterns and being mindful of agricultural practices are crucial for managing health risks. The monsoon offers the most favourable conditions for outdoor activities, though precautions against waterborne diseases are necessary.