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Thāne occupies a strategic position in the Mumbai Metropolitan Region of Maharashtra, India, situated on the northeastern banks of Thane Creek, an inlet of the Arabian Sea. This coastal location at approximately 19.1972°N, 72.9722°E places it within the Konkan coastal belt, characterized by low-lying terrain with an average elevation of just 7 meters above sea level. The city's geography creates a complex urban-rural gradient, transitioning from dense urban cores to suburban and peri-urban zones, with the Sanjay Gandhi National Park to the north and east providing a significant green buffer. Thāne's position within the Mumbai-New Delhi industrial corridor means it sits amidst extensive industrial activity, including manufacturing zones in neighboring areas like Navi Mumbai and Kalyan. The city's proximity to the Arabian Sea influences local wind patterns, while its location between the Western Ghats and the coast creates specific microclimatic conditions. Urban expansion has transformed former wetlands and agricultural lands into built-up areas, reducing natural ventilation corridors. The combination of industrial emissions from nearby zones, vehicular pollution from Mumbai-Thane connectivity corridors, construction dust from rapid urbanization, and occasional agricultural residue burning from surrounding rural areas creates a multi-source pollution profile. The city's low elevation and coastal position can trap pollutants during certain meteorological conditions, particularly when sea breezes interact with urban heat island effects.

Thāne's air quality follows distinct seasonal patterns shaped by the Indian subcontinent's monsoon cycle. During winter (December-February), cool temperatures and frequent temperature inversions trap pollutants close to the ground, creating persistent haze and fog, particularly in January. This season sees the highest pollution concentrations as calm winds and stable atmospheric conditions prevent dispersion. Spring (March-May) brings gradually rising temperatures and decreasing humidity, with pollution levels remaining elevated due to increased construction activity and dust storms from drier regions. The pre-monsoon period in May often experiences high ozone formation under intense sunlight. Summer monsoon (June-September) dramatically improves air quality as southwest monsoon winds from the Arabian Sea sweep across the region, washing away pollutants through heavy rainfall and providing strong ventilation. This period offers the cleanest air for outdoor activities. Post-monsoon (October-November) sees a rapid deterioration as monsoon winds retreat, humidity drops, and agricultural burning in surrounding regions contributes to haze formation. Sensitive groups including children, elderly, and those with respiratory conditions should minimize outdoor exposure during winter mornings and post-monsoon evenings when pollution peaks, while scheduling outdoor activities for monsoon afternoons when air is freshest. Monitoring local air quality indices during transitional seasons is particularly important as conditions can change rapidly.