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Vettūr, a municipality nestled within the Thrissur district of Kerala, India, occupies a relatively low-lying coastal plain location at approximately 8.72°N latitude and 76.74°E longitude. The terrain is predominantly flat, characteristic of the midland region of Kerala, transitioning from the Western Ghats to the Arabian Sea. This positioning significantly influences air quality. Vettūr is not directly on the coast, but benefits from the moderating influence of proximity to the Arabian Sea, experiencing high humidity for much of the year. The surrounding landscape is a mosaic of rice paddies, coconut plantations, and rubber farms – typical of Kerala’s agricultural heartland. While Vettūr itself isn’t a major industrial hub, its location within a densely populated state means it’s affected by regional pollution transport. The urban-rural gradient is relatively sharp, with agricultural land immediately surrounding the municipal area. This creates localized sources of biomass burning during agricultural practices, impacting air quality. Roadside dust from the extensive network of local roads and the increasing vehicle density contribute to particulate matter concentrations. The relatively flat topography limits natural dispersion of pollutants, potentially leading to localized build-up, particularly during calm weather conditions. Understanding these geographical factors is crucial for addressing Vettūr’s air quality challenges.

Vettūr’s air quality follows a distinct seasonal pattern dictated by the monsoon and inter-monsoon periods. The southwest monsoon, typically arriving in June and lasting until September, generally brings improved air quality. Heavy rainfall effectively washes away particulate matter, and increased humidity suppresses dust. However, this period can also see localized flooding, potentially releasing pollutants from stagnant water. October to December represents the post-monsoon season, often experiencing calmer winds and temperature inversions, trapping pollutants near the ground. This is a period when air quality can deteriorate, particularly from biomass burning associated with post-harvest activities. January to March are the driest months, with increased dust and vehicle emissions contributing to poorer air quality. The pre-monsoon season, April and May, sees rising temperatures and dry winds, exacerbating pollution levels. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during these drier months. Fog formation during cooler mornings can also trap pollutants. Monitoring wind patterns is vital; winds from the east can carry pollutants from inland areas, while westerly winds generally bring cleaner air from the sea. Overall, the monsoon months offer the most favourable conditions for outdoor activity.