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Nambiyūr, nestled in the Tiruchirappalli district of Tamil Nadu, India, occupies a geographically significant position within the Kaveri Delta, a fertile and densely populated region. Located at approximately 11.3581° N, 77.3211° E, the town sits at a modest elevation, contributing to a relatively flat terrain characteristic of the deltaic plains. This low elevation, while beneficial for agriculture, presents challenges regarding air quality dispersion. The surrounding landscape is dominated by agricultural fields – primarily rice paddies and sugarcane plantations – interspersed with smaller villages and pockets of scrubland. The proximity to the Kaveri River, though providing a vital water source, can also influence local weather patterns and contribute to humidity, potentially affecting pollutant behaviour. Nambiyūr’s urban character is that of a small, developing town, transitioning from a predominantly rural setting. The urban–rural gradient is gradual, with agricultural activities continuing within the town's immediate periphery. While not directly adjacent to major industrial belts, Nambiyūr’s location within the broader Tiruchirappalli region means it is indirectly influenced by industrial emissions from nearby cities. The flat topography and prevailing wind patterns often lead to pollutants accumulating, particularly during periods of low wind speed and stable atmospheric conditions. The delta's dense population and agricultural practices, including the burning of crop residue, further exacerbate local air quality concerns. The surrounding landscape, while visually appealing, contributes to a complex interplay of factors impacting Nambiyūr's air quality.

Nambiyūr experiences a tropical climate with distinct wet and dry seasons, significantly influencing its air quality profile. The dry season, typically spanning from March to May, often witnesses a noticeable increase in particulate matter. This is largely attributed to the prevalent practice of crop residue burning following the harvest of rice and sugarcane. Reduced rainfall and higher temperatures during this period contribute to stagnant air conditions, hindering pollutant dispersion. The meteorological conditions are often characterised by calm winds and occasional temperature inversions, trapping pollutants close to the ground. Conversely, the monsoon season (June to October) brings relief through increased rainfall, which naturally washes away particulate matter and improves air quality. Stronger winds associated with the monsoon also facilitate better ventilation. November and February represent transitional periods, with fluctuating weather patterns. Fog, common during these months, can trap pollutants, leading to temporary episodes of reduced visibility and elevated air quality concerns. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak pollution hours, typically in the morning and late afternoon. The monsoon months generally offer a more favourable environment for outdoor pursuits. Agricultural workers are particularly vulnerable to the effects of crop residue smoke during the dry season and should utilise appropriate respiratory protection. Maintaining awareness of local weather conditions and adhering to public health advisories is crucial for mitigating potential health risks associated with air pollution in Nambiyūr.