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Vandalūr, a town in Tamil Nadu, India, situated at 12.8924°N latitude and 80.0808°E longitude, presents a unique geographic context influencing its air quality. The town lies within the relatively flat coastal plains of the state, a landscape dominated by alluvial soils and interspersed with patches of scrubland. Its elevation is low, averaging around 65 meters above sea level, contributing to limited atmospheric dispersion of pollutants. Vandalūr is part of the Chennai Metropolitan Area, experiencing a strong urban-rural gradient as it transitions from the densely populated city centre to more agricultural areas further inland. The proximity to Chennai, a major industrial hub, is a significant factor; prevailing winds often carry pollutants from industrial zones towards Vandalūr. The Pallavaram hills, located nearby, offer some topographical influence on local wind patterns, but their effect is limited. The presence of the Vedanthangal Bird Sanctuary, a wetland ecosystem a short distance away, highlights the sensitivity of the surrounding environment. Agricultural activity, particularly rice cultivation, contributes to seasonal biomass burning, impacting local air quality. The overall geography fosters conditions where pollutants can accumulate, particularly during periods of low wind speed and temperature inversions.

Vandalūr’s air quality follows a distinct seasonal pattern dictated by the monsoon cycles and prevailing winds. The northeast monsoon, from October to December, brings relatively cleaner air as rainfall washes away particulate matter. However, increased humidity can also exacerbate respiratory issues. January to March sees drier conditions and a build-up of pollutants, particularly from vehicular emissions and local industries, making these months less favourable for outdoor activity. The summer months, April to May, are characterised by intense heat and stagnant air, leading to temperature inversions that trap pollutants near the ground, resulting in peak pollution levels. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor exertion during this period. The southwest monsoon, from June to September, offers a respite, with frequent rainfall improving air quality. However, increased cloud cover can also lead to reduced sunlight and increased humidity. Post-monsoon, in September-October, a transitional period can see fluctuating pollution levels. Overall, avoiding prolonged outdoor exposure during the summer and drier winter months is advisable, while the monsoon seasons generally offer better air quality.