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Tirur is a historic municipality situated in the Malappuram district of northern Kerala, positioned at coordinates 10.9103°N, 75.9233°E along India's southwestern Malabar Coast. The city lies approximately 25 kilometers inland from the Arabian Sea, nestled within the flat coastal plains of the Bharathapuzha River basin, with an average elevation of just 15 meters above sea level. This low-lying terrain creates a natural amphitheater effect that traps pollutants, particularly during dry periods when atmospheric mixing is minimal. Tirur functions as a crucial transportation hub connecting the coastal cities of Kozhikode and Kochi with inland agricultural regions, resulting in significant vehicular traffic that contributes to local pollution. The urban landscape blends traditional Kerala architecture with modern commercial development, surrounded by extensive paddy fields, coconut groves, and areca nut plantations that characterize the region's agrarian economy. Proximity to the Bharathapuzha River—Kerala's second-longest river—provides some natural ventilation but also supports agricultural burning practices that degrade air quality. The city's position within Kerala's densely populated coastal belt places it at the intersection of urban emissions and rural biomass burning, creating a complex pollution profile influenced by both local sources and regional agricultural patterns across the Malappuram and Thrissur districts.

Tirur's tropical monsoon climate creates distinct seasonal air quality patterns driven by the interplay between pollution sources and meteorological conditions. During the pre-monsoon months of March through May, air quality deteriorates significantly as high temperatures, low humidity, and stagnant winds create thermal inversions that trap pollutants close to the ground. This period coincides with peak agricultural burning—particularly of crop residues in nearby paddy fields—and increased road dust from dry conditions, making these months particularly hazardous for outdoor activities. The southwest monsoon from June to September brings dramatic improvement as heavy rains wash pollutants from the atmosphere and strong sea breezes provide natural ventilation, though flooding can temporarily suspend outdoor activities. Post-monsoon months of October and November see moderate air quality as humidity decreases and temperatures become more comfortable, though occasional biomass burning for land preparation occurs. The mild winter from December to February experiences some pollution accumulation due to cooler temperatures and reduced wind speeds, though conditions remain better than during the pre-monsoon peak. Sensitive groups including children, elderly residents, and those with respiratory conditions should minimize outdoor exposure during March-May, particularly during morning hours when inversion layers are strongest, and consider using air purifiers indoors during these peak pollution months.