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Rājupālem, a small town in the Prakasam district of Andhra Pradesh, India, sits at coordinates 15.1385°N, 79.9960°E. The terrain is largely flat, characteristic of the Krishna Delta region, with an elevation hovering around 15 meters above sea level. This low-lying position contributes to limited natural air dispersion. The town is situated inland, approximately 25 kilometers from the Bay of Bengal, meaning direct marine influences on air quality are moderate, though sea breezes can occasionally offer temporary relief. Surrounding Rājupālem is a predominantly agricultural landscape, dominated by rice paddies and other crops. While not a major industrial hub itself, the town’s proximity to larger industrial areas along the coast and the expanding urban centres of Ongole and Chirala introduces potential for pollutant transport. The urban-rural gradient is relatively sharp; immediately surrounding the town are agricultural fields, transitioning to more sparsely populated rural areas. Dust from agricultural activities, particularly during harvesting and land preparation, is a significant local source of particulate matter. The local topography offers little in the way of natural barriers to airflow, making the town susceptible to pollutant build-up during stagnant weather conditions. Understanding this geographic context is crucial for interpreting Rājupālem’s air quality challenges.

Rājupālem experiences a tropical climate, with distinct wet and dry seasons heavily influencing air quality. The dry season, from November to May, typically sees the poorest air quality. Lower humidity and higher temperatures promote dust resuspension from agricultural lands and unpaved roads. January to March are particularly challenging, with stable atmospheric conditions and temperature inversions trapping pollutants near the ground. The monsoon season, from June to October, brings significant rainfall, effectively washing away particulate matter and improving air quality. However, increased humidity can also foster mold growth, impacting respiratory health. August and September generally offer the cleanest air. Post-monsoon, in October-November, a slight deterioration occurs as agricultural burning increases to prepare fields for the next crop. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the dry season, particularly in the mornings. During the monsoon, while air is cleaner, precautions against waterborne diseases are essential. Wind patterns, predominantly from the west during the monsoon and variable during the dry season, play a key role in pollutant dispersion, or lack thereof. Fog formation during cooler months can exacerbate particulate matter concentrations.