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Nanjanād, a small town nestled in the Tiruppur district of Tamil Nadu, India, occupies a relatively flat terrain at an elevation of approximately 240 meters. Its coordinates (11.3669°N, 76.6415°E) place it within the fertile Noyyal River basin, a region historically renowned for its cotton production. The surrounding landscape is predominantly agricultural, characterized by intensive farming practices, particularly cotton and turmeric cultivation. This agricultural dominance, while economically vital, contributes significantly to localised air quality concerns through the use of pesticides, fertilizers, and biomass burning for land preparation. Nanjanād’s proximity to the larger industrial hub of Tiruppur, a major textile centre, introduces further complexities. While not directly within the most heavily industrialised zones, the town experiences spillover effects from textile processing and dyeing units, including potential emissions of volatile organic compounds and particulate matter. The urban-rural gradient is relatively sharp, with Nanjanād serving as a market and service centre for surrounding villages. The Noyyal River, though often seasonal in flow, plays a crucial role in the local ecosystem and can influence the dispersion of pollutants, particularly during periods of low rainfall. Understanding this interplay between agriculture, industry, and the local topography is essential for addressing Nanjanād’s air quality challenges.

Nanjanād’s air quality follows a distinct seasonal pattern dictated by the monsoon cycles and agricultural practices. The southwest monsoon, arriving in June and lasting through September, generally brings improved air quality due to rainfall washing away particulate matter and suppressing dust. However, increased humidity can also contribute to the formation of mould spores, potentially impacting respiratory health. October to December marks a transition period, with decreasing rainfall and increasing temperatures, often leading to a build-up of pollutants. This is exacerbated by post-monsoon agricultural activities like harvesting and burning of crop residue. January to March are typically the driest months, and consequently, the period of poorest air quality. Dust storms are common, and the lack of rainfall allows pollutants from agricultural and industrial sources to accumulate. Temperature inversions, where a layer of warm air traps cooler air near the ground, can further worsen conditions. April and May, the hottest months, see increased evaporation and potential for ground-level ozone formation. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during these months. Monitoring wind patterns is crucial; winds from the direction of Tiruppur can bring industrial pollutants. Avoiding peak hours near agricultural fields during harvest season is also advisable.