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Irikkūr, nestled in the Kannur district of Kerala, India, occupies a geographically significant position within the Malabar region. Located at approximately 11.97°N, 75.57°E, the city’s terrain is characterized by undulating hills and valleys, typical of Kerala’s Western Ghats foothills. The elevation, though modest, contributes to localized microclimates and influences air circulation patterns. Irikkūr benefits from proximity to the Arabian Sea, approximately 20 kilometers to the west, which moderates temperatures and introduces maritime influences on air quality. The surrounding landscape is predominantly rural, a patchwork of lush agricultural fields – primarily rice paddies and coconut groves – interspersed with small-scale plantations. This agricultural zone, while generally beneficial, can contribute to seasonal biomass burning during harvest periods, impacting local air quality. The urban–rural gradient is relatively sharp; Irikkūr itself is a small town, transitioning quickly to agricultural land and then to denser forest cover further inland. The town’s location within a relatively isolated area means it’s less directly impacted by major industrial belts, although it does experience some indirect effects from industrial activity in larger regional centers like Kannur. The prevailing winds, generally southwesterly during the monsoon and northwesterly during the dry season, play a crucial role in dispersing or concentrating pollutants. The topography, with its hills and valleys, can create localized areas of stagnant air, particularly during periods of low wind speed, exacerbating air quality issues. The presence of the nearby Moyali River also influences humidity and local weather patterns, indirectly affecting pollutant dispersion.

Irikkūr’s tropical climate dictates a distinct wet and dry season cycle, profoundly influencing its air quality. The southwest monsoon, typically spanning from June to September, brings abundant rainfall, effectively cleansing the atmosphere and significantly reducing particulate matter. This period generally offers the best air quality, with frequent rain showers washing away pollutants and strong winds dispersing any accumulated emissions. However, the onset of the monsoon can sometimes be preceded by periods of stagnant air and elevated humidity, creating conditions conducive to the build-up of pollutants. The dry season, from October to May, presents a different challenge. Reduced rainfall and lower humidity lead to a build-up of dust and other particulate matter. Temperature inversions, common during the cooler months (December-February), trap pollutants near the ground, potentially worsening air quality. Agricultural burning, particularly during the post-harvest season (November-December), contributes significantly to localized pollution episodes. Fog, which can occur during the winter months, further restricts air movement and concentrates pollutants. The months of January and February often experience the poorest air quality due to a combination of temperature inversions, reduced rainfall, and agricultural practices. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during these periods, limiting outdoor exertion and monitoring for any adverse health effects. During the monsoon months, while generally cleaner, individuals with allergies should be mindful of increased pollen counts and humidity.