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Doranāla, a small town in the Prakasam district of Andhra Pradesh, India, sits at coordinates 15.9000°N, 79.1000°E. The terrain is largely undulating, characteristic of the Eastern Ghats foothills, transitioning from coastal plains inland. The town’s elevation is relatively low, contributing to limited atmospheric dispersion of pollutants. Doranāla is not directly on the coast, but lies within the influence of the Bay of Bengal, experiencing a humid subtropical climate. Surrounding the town are predominantly agricultural lands, primarily cultivating rice, pulses, and oilseeds. While not a major industrial hub itself, Doranāla’s proximity to larger towns like Ongole (approximately 30km) and industrial areas along the coast means it’s susceptible to regional pollution transport. The urban-rural gradient is quite sharp; the town centre is densely populated, while the periphery quickly gives way to farmland. This creates localized pollution hotspots around market areas and transport routes. Dust from agricultural activities, particularly during harvesting and land preparation, is a significant contributor to particulate matter. The lack of extensive green cover within the town limits further exacerbates the situation, reducing the natural filtering capacity of the environment. The local topography, with limited natural ventilation, traps pollutants, especially during calm weather conditions.

Doranāla’s air quality follows a distinct seasonal pattern. The post-monsoon period (October-November) often sees a temporary improvement as rainfall washes away accumulated pollutants. However, this is short-lived. Winter (December-February) brings cooler temperatures and increased temperature inversions, trapping pollutants near the ground, leading to higher concentrations of particulate matter and gaseous pollutants from biomass burning for warmth. This is a period to avoid strenuous outdoor activity, particularly for those with respiratory conditions. The pre-monsoon months (March-May) are the most challenging, with rising temperatures, dry winds carrying dust from agricultural lands, and increased evaporation contributing to poor air quality. April and May are particularly unfavourable. The arrival of the southwest monsoon (June-September) provides significant relief, as heavy rainfall effectively cleanses the atmosphere. However, increased humidity can also promote the formation of secondary pollutants. During the monsoon, mould spores become prevalent, posing a risk to allergy sufferers. Overall, the monsoon season offers the best air quality, while the pre-monsoon period demands the greatest caution. Sensitive groups – children, the elderly, and those with pre-existing respiratory or cardiovascular conditions – should limit outdoor exposure during peak pollution periods.