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Nestled in the Malappuram district of northern Kerala, Manjeri occupies a strategic position in the undulating terrain of the Malabar region, approximately 30 kilometres southeast of the Arabian Sea coastline. Situated at coordinates 11.1192°N, 76.1193°E with an elevation around 40-50 metres above sea level, this town lies within the broader Chaliyar River basin, with the river flowing nearby to the east, influencing local humidity patterns. Manjeri's geography is characterised by a transitional urban-rural gradient, where the compact town centre gives way to lush agricultural zones dominated by paddy fields, coconut groves, and rubber plantations, typical of Kerala's agrarian landscape. The surrounding Western Ghats foothills to the east create a topographical funnel that can trap pollutants, particularly during dry periods, while proximity to National Highway 966 enhances connectivity but also introduces persistent vehicle emissions. This location, part of Kerala's densely populated Malappuram district, places Manjeri within a region experiencing rapid urbanisation, with small-scale industrial units and construction activities contributing to localised dust pollution. The tropical monsoon climate ensures high annual rainfall, which naturally cleanses the air but also leads to seasonal challenges like waterlogging that can temporarily suspend dust. The town's position away from major industrial belts like Kochi or Kozhikode means pollution is primarily hyperlocal, driven by internal combustion, unpaved roads, and occasional waste burning, exacerbated by the valley-like setting that limits dispersion during calm weather.

Manjeri's air quality follows a distinct seasonal rhythm shaped by its tropical monsoon climate, with peak pollution occurring from March to May during the pre-monsoon summer. These months experience high temperatures, low humidity, and stagnant winds, creating thermal inversions that trap vehicle exhaust, road dust, and construction emissions near the ground, making outdoor activities particularly hazardous for sensitive groups like asthmatics, children, and the elderly. The southwest monsoon from June to September brings heavy rains that wash away pollutants, leading to the cleanest air of the year, though flooding and landslides pose other risks. October and November see a transitional period with moderate pollution as the northeast monsoon sets in, while December to February offers relatively good air quality with cooler temperatures and occasional sea breezes from the Arabian Sea aiding dispersion. Sensitive individuals should avoid prolonged outdoor exposure during the peak months, opting for early mornings when pollution levels are lower, and monitor local weather advisories for dust storms or haze. The monsoon season, despite its cleansing effect, requires caution due to high humidity that can exacerbate respiratory issues in mould-prone environments. Overall, planning outdoor activities from June to February is advisable, with extra vigilance during the dry pre-monsoon phase when particulate matter concentrations surge.