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Aliyābād, a small town in Tamil Nadu, India, rests at coordinates 12.6317°N, 79.2164°E, within the fertile Kaveri Delta region. Its relatively low elevation, typical of the coastal plains, contributes to limited atmospheric dispersion of pollutants. The surrounding landscape is predominantly agricultural, characterized by extensive paddy fields and coconut groves, a common feature of this part of Tamil Nadu. This agricultural intensity, while vital to the local economy, introduces sources of air pollution through fertilizer use, pesticide application, and biomass burning of agricultural residue post-harvest. Aliyābād’s proximity to the Bay of Bengal influences its climate, bringing humid conditions and seasonal monsoon rains. The urban-rural gradient is quite sharp; Aliyābād itself is a compact settlement, quickly transitioning to rural farmland. While not a major industrial hub, the presence of small-scale brick kilns and rice mills in the vicinity contributes to particulate matter emissions. The town’s location within a relatively flat terrain limits natural ventilation, exacerbating pollution build-up, particularly during calmer weather conditions. Understanding this interplay between agriculture, local industry, and the coastal environment is crucial for assessing and mitigating air quality challenges in Aliyābād.

Aliyābād’s air quality follows a distinct seasonal pattern dictated by the monsoon and prevailing winds. The pre-monsoon months of April and May see a peak in pollution, driven by high temperatures, low humidity, and increased dust from agricultural activities. Calm winds trap pollutants, leading to poorer air quality. The arrival of the Southwest Monsoon in June brings temporary relief, as rainfall washes away particulate matter and increased humidity suppresses dust. However, increased cloud cover can also contribute to temperature inversions, trapping pollutants closer to the ground. Post-monsoon (September-November) sees a gradual deterioration as agricultural burning intensifies after the harvest. The Northeast Monsoon, arriving in late November, again offers a period of cleansing, though it can be accompanied by increased humidity and fog, potentially trapping pollutants. The winter months (December-February) are generally the most favourable for air quality, with cooler temperatures and moderate winds aiding dispersion. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the pre-monsoon and post-monsoon periods. Monitoring wind direction and avoiding peak agricultural burning times are advisable.