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Orumanayūr, a small town nestled within the verdant landscape of Kerala, India, occupies a relatively low-lying position at approximately 10.56°N, 76.03°E. Its geography is defined by the coastal plains characteristic of this region, transitioning inland towards the foothills of the Western Ghats. The town’s elevation is minimal, contributing to limited natural dispersion of pollutants. Orumanayūr benefits from proximity to the Arabian Sea, approximately 20km west, which introduces sea breezes but also potential for humidity-driven pollutant formation. The surrounding area is predominantly agricultural, with rice paddies and coconut groves dominating the landscape. While not a major industrial hub itself, Orumanayūr is situated within a region experiencing increasing industrial activity in nearby towns like Thrissur and Palakkad, potentially contributing to regional background pollution. The urban-rural gradient is quite sharp; the town itself is compact, quickly giving way to agricultural land. This proximity to agricultural practices introduces potential for seasonal biomass burning, impacting local air quality. The terrain, largely flat, restricts airflow and can exacerbate pollution episodes, particularly during calm weather conditions. Understanding this interplay of coastal influence, agricultural practices, and regional industrialisation is crucial for assessing Orumanayūr’s air quality challenges.

Orumanayūr experiences a distinct wet and dry season, heavily influenced by the Southwest Monsoon. Air quality generally improves during the monsoon months (June-September) as rainfall effectively washes away particulate matter and increased humidity suppresses dust. However, high humidity can also promote the formation of secondary pollutants. The post-monsoon season (October-November) sees a gradual increase in pollution as agricultural activities resume, including potential crop residue burning. This is a period of moderate air quality. The dry season (December-February) is typically the most challenging, with lower rainfall, increased dust from construction and vehicle emissions, and a greater propensity for temperature inversions, trapping pollutants near the ground. January and February are often the months with the poorest air quality. The pre-monsoon season (March-May) sees rising temperatures and drier conditions, exacerbating dust and increasing ozone formation. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the dry season, particularly in the afternoons. Wearing masks and monitoring health are advisable. The monsoon offers a respite, but mould growth indoors can pose respiratory risks.