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Kodayattūr, nestled in the Malabar region of Kerala, India, occupies a geographically significant position within a landscape sculpted by the Western Ghats. Located at approximately 11.28°N, 75.98°E, the town’s elevation, though modest, contributes to localized microclimates. The surrounding terrain is characterized by undulating hills and valleys, typical of Kerala’s coastal plains gradually rising towards the mountains. This topography influences air circulation patterns; valleys can trap pollutants, while higher elevations experience greater dispersion. Kodayattūr’s proximity to the Arabian Sea, roughly 20 kilometers to the west, introduces a maritime influence, moderating temperatures and occasionally bringing in sea breezes that can dilute pollutants. The region is predominantly rural, transitioning from small agricultural plots to denser settlements as one approaches larger towns. The dominant land use is agriculture, with rice cultivation and spice plantations being prevalent. While Kodayattūr itself lacks major industrial zones, it sits within a broader agricultural belt, and the potential for fertilizer and pesticide use, along with biomass burning during agricultural cycles, can impact local air quality. The urban–rural gradient is relatively smooth, with Kodayattūr representing a small, localized hub within a largely agrarian setting. The Western Ghats to the east act as a barrier, influencing wind patterns and potentially trapping pollutants under certain meteorological conditions. The town’s location within a humid tropical climate further complicates air quality dynamics, with high humidity often impacting the dispersion of particulate matter.

Kodayattūr’s tropical climate dictates a distinct wet and dry season pattern, profoundly influencing its air quality. The southwest monsoon, typically arriving in June and lasting through September, brings torrential rainfall, effectively scrubbing the atmosphere and significantly reducing particulate matter concentrations. This period generally offers the best air quality, with frequent rain showers washing away dust and pollutants. However, the onset of the monsoon can be accompanied by increased humidity, which can exacerbate respiratory issues for sensitive individuals. The dry season, spanning roughly October to May, presents a different challenge. Reduced rainfall leads to a build-up of dust and pollutants, particularly during periods of agricultural activity involving burning of crop residue. Temperature inversions, more common during the cooler months (December-February), can trap pollutants near the ground, leading to localized episodes of poorer air quality. Fog, particularly in the mornings during the dry season, further restricts atmospheric mixing and can concentrate pollutants. The months of March and April, preceding the monsoon, often experience the highest levels of suspended particulate matter due to agricultural practices and drier conditions. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during these months, limiting outdoor exertion and monitoring for any adverse health effects. During the monsoon months, while overall air quality improves, high humidity can still trigger respiratory discomfort. Maintaining indoor air quality through ventilation and air purification can be beneficial throughout the year.