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Nattam, a municipality in Tamil Nadu, India, occupies a relatively flat terrain at approximately 70 meters above sea level (based on coordinate data). Its location within the fertile Kaveri Delta region significantly shapes its character. The surrounding landscape is predominantly agricultural, dominated by paddy fields and coconut groves, typical of the Tamil Nadu plains. Nattam’s proximity to the Kaveri River, a vital freshwater source, influences local humidity and microclimates. While not directly within a major industrial belt, the broader Thanjavur district, of which Nattam is a part, experiences agricultural processing and related industries, contributing to localised emissions. The urban-rural gradient is pronounced; Nattam serves as a market and service centre for surrounding villages, resulting in increased vehicular traffic and localised dust generation. The prevailing winds, influenced by the seasonal monsoon patterns, play a crucial role in dispersing or concentrating pollutants. The relatively low elevation and flat topography can exacerbate pollution build-up, particularly during calm weather conditions. The density of vegetation in the surrounding agricultural areas offers some natural air purification, but this is offset by agricultural practices like stubble burning, which can contribute to seasonal spikes in particulate matter. Understanding this interplay of geography and activity is key to addressing Nattam’s air quality challenges.

Nattam experiences a tropical climate with distinct wet and dry seasons, profoundly impacting air quality. The dry season, from February to May, sees rising temperatures and reduced rainfall, leading to increased dust suspension from agricultural lands and roads. Calm wind conditions during this period can trap pollutants, worsening air quality. April and May are typically the least favourable months for outdoor activity, particularly for those with respiratory conditions. The southwest monsoon arrives in June, bringing relief from the heat and washing away accumulated pollutants. However, increased humidity can also promote the formation of secondary pollutants. The post-monsoon season (October-November) often sees a resurgence of pollution due to stagnant air and the practice of agricultural residue burning after the harvest. November can be particularly challenging. The northeast monsoon, from October to December, brings heavier rainfall, generally improving air quality, but can also lead to localised flooding and waterborne disease risks. During the wetter months, mould spores become more prevalent, impacting sensitive individuals. Sensitive groups – children, the elderly, and those with pre-existing respiratory or cardiovascular conditions – should limit outdoor exposure during peak pollution periods and consider using respiratory protection.