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Dindigul occupies a strategic position in the fertile plains of Tamil Nadu, nestled at the foothills of the Western Ghats and the Sirumalai range, with coordinates placing it approximately 10.3624°N, 77.9695°E. This city of over 200,000 residents sits at an elevation of about 265 meters above sea level, which moderates its tropical climate but traps pollutants in its basin-like terrain. Dindigul's urban character blends historic fortifications with bustling commercial zones, transitioning into agricultural hinterlands dominated by cotton, millet, and tobacco cultivation. The city lies within the Palar River basin, though water bodies are seasonal, contributing to dust issues during dry periods. Its location along major transportation corridors connecting Madurai, Coimbatore, and Tiruchirappalli intensifies vehicle emissions, while the surrounding landscape—comprising dry deciduous forests and agricultural fields—creates a distinct urban–rural gradient where crop residue burning directly impacts air quality. Proximity to industrial clusters, particularly tanneries in nearby towns like Erode, adds regional pollution burdens. The terrain's bowl-like formation, combined with frequent temperature inversions, hinders pollutant dispersion, making geographic context a critical determinant of Dindigul's persistent air quality challenges.

Dindigul's air quality follows a pronounced seasonal rhythm shaped by its tropical wet-and-dry climate. During the winter months from December to March, pollution peaks dramatically due to meteorological stagnation—cooler temperatures create frequent ground-level inversions that trap vehicle exhaust, industrial emissions from tanneries and lock manufacturing, and agricultural burning residues. These months also see increased construction activity and road dust, exacerbated by dry northeasterly winds. Sensitive groups, including children, the elderly, and those with respiratory conditions, should limit outdoor exertion during this period, particularly in early mornings when fog combines with pollutants. The summer months of April to June bring extreme heat, which can elevate ozone levels, though stronger winds provide some dispersion relief. The southwest monsoon from June to September offers the cleanest air, as rains wash away particulate matter and suppress dust, making this the optimal time for outdoor activities. However, cyclonic threats and flooding can temporarily disrupt air quality. The brief northeast monsoon from October to November transitions back to drier conditions, with rising pollution levels. Year-round, residents should monitor local air quality advisories and use protective masks during peak pollution episodes.