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Nanguneri is a small town situated in the Tirunelveli district of Tamil Nadu, India, positioned at coordinates 8.4900°N, 77.6500°E within the broader South Asian region. Nestled in the southern part of the Indian peninsula, its geography is characterised by a relatively flat terrain with gentle undulations, typical of the Deccan Plateau's southern extensions, at an elevation of approximately 50-100 meters above sea level. The town lies inland, about 50 kilometers from the Gulf of Mannar to the east, which moderates coastal influences but does not provide significant marine breezes to disperse pollutants effectively. Surrounded by extensive agricultural zones, particularly paddy fields and coconut groves, Nanguneri operates on an urban-rural gradient where traditional farming practices blend with growing urbanisation. This setting exacerbates air quality issues as agricultural biomass burning from nearby fields and residential wood combustion in peri-urban areas release particulate matter. The region is part of Tamil Nadu's southern agricultural belt, with no major industrial clusters nearby, but local vehicular emissions from National Highway 44 and construction dust from infrastructure projects contribute to pollution. The town's location in a tropical wet-and-dry climate zone means it experiences distinct wet and dry seasons, with the latter fostering stagnant air conditions that trap pollutants, compounded by its inland position away from strong coastal winds that might otherwise aid dispersion.

In Nanguneri's tropical wet-and-dry climate, air quality fluctuates dramatically across seasons, driven by meteorological patterns and human activities. During the winter months from November to February, pollution peaks due to a combination of factors: agricultural biomass burning after the harvest season, increased residential wood and biomass combustion for heating, and frequent temperature inversions that trap pollutants near the ground. Calm winds and foggy conditions further hinder dispersion, making this period particularly hazardous for outdoor activities, especially for sensitive groups like children, the elderly, and those with respiratory conditions who should limit exposure. The summer season from March to May sees extreme heat, which can elevate ground-level ozone from vehicular emissions and commercial diesel generators, though occasional pre-monsoon thunderstorms provide temporary relief by washing out pollutants. The southwest monsoon from June to September brings heavy rainfall, significantly improving air quality by scrubbing particulate matter and reducing dust, making it the best time for outdoor pursuits despite risks of flooding. The post-monsoon period in October transitions back to drier conditions, with pollution levels beginning to rise as biomass burning resumes. To mitigate health risks, residents should monitor local air quality advisories, use masks during peak pollution months, and plan outdoor activities for the monsoon season when air is cleaner.