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Kollengode, nestled in the Palakkad district of Kerala, India, occupies a unique geographic position within the Western Ghats foothills. Located at coordinates 10.6139°N, 76.6908°E, the town’s terrain is characterised by gently rolling hills and plains, transitioning from the higher elevations of the Ghats to the more level lands towards the west. This location significantly influences its air quality. The surrounding landscape is predominantly agricultural, with extensive paddy fields and coconut plantations, alongside pockets of deciduous forest. Kollengode isn’t directly adjacent to major industrial belts, but benefits from proximity to industrial areas further north in Palakkad, potentially receiving transported pollutants. The urban-rural gradient is relatively sharp; the town itself is compact with a population of approximately 29,587, quickly giving way to rural agricultural land. The lack of significant natural barriers to air flow means pollutants can disperse, but also be readily drawn in from surrounding areas. The presence of the Western Ghats creates orographic lift, influencing rainfall patterns and potentially trapping pollutants during temperature inversions. Proximity to smaller rivers and streams doesn’t offer substantial air purification benefits, but contributes to local humidity, affecting pollutant chemistry. Understanding this interplay of terrain, land use, and regional climate is crucial for assessing Kollengode’s air quality.

Kollengode experiences a distinct tropical climate, with air quality fluctuating significantly between the monsoon and dry seasons. The southwest monsoon, typically arriving in June and lasting until September, brings heavy rainfall which effectively washes particulate matter from the atmosphere, resulting in generally improved air quality during these months. However, increased humidity can also promote the formation of secondary pollutants. October to February constitutes the drier season, marked by lower rainfall and often stagnant air conditions. This period sees a build-up of pollutants from local sources – vehicular emissions, biomass burning for agricultural purposes, and dust from unpaved roads. Temperature inversions, common during cooler mornings in these months, exacerbate the problem by trapping pollutants near ground level. March to May is the hottest and driest period, with increased dust and potential for wildfires contributing to poor air quality. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during these months. Fog, prevalent in cooler months, can also trap pollutants. November to February are generally the least favourable months for outdoor activity, while June to September offer the best air quality. Staying indoors during peak pollution times and using air purifiers are recommended.