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Pavannur, nestled in the Malabar region of Kerala, India, occupies a geographically significant position within a landscape dominated by the Western Ghats. Located at approximately 11.95°N, 75.50°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, with dense tropical vegetation and interspersed agricultural land. Pavannur’s proximity to the Arabian Sea, roughly 20 kilometers to the west, influences humidity levels and coastal breezes, which can both disperse and concentrate pollutants depending on prevailing wind patterns. The town sits within a gradual urban–rural gradient; while Pavannur itself is a relatively small settlement, it’s part of a larger network of villages and towns within the Kozhikode district. Agricultural activities, primarily focused on spices, coconut, and rice cultivation, are prevalent in the immediate vicinity, potentially contributing to localized emissions from agricultural practices and biomass burning, particularly during harvest seasons. Further afield, the industrial belt around Kozhikode, though not directly adjacent, can influence regional air quality. The Ghats to the east act as a barrier, sometimes trapping pollutants, while also providing a source of relatively clean air during periods of strong easterly winds. The overall geography creates a complex interplay of factors impacting Pavannur’s air quality, making it sensitive to both local and regional pollution sources.

Pavannur’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 until September, brings torrential rainfall, effectively scrubbing the atmosphere and significantly reducing particulate matter and gaseous pollutants. This period generally offers the best air quality, with frequent cleansing rains and increased wind speeds dispersing any accumulated emissions. Conversely, the pre-monsoon months (March-May) often experience a build-up of pollutants. Hot, dry conditions and stagnant air, coupled with occasional dust storms originating from the north, can lead to poorer air quality. Temperature inversions, common during these months, trap pollutants near the ground, exacerbating the situation. The post-monsoon season (October-November) sees a gradual improvement as rainfall decreases, but humidity remains high, potentially trapping pollutants. Fog, particularly in November, can also reduce visibility and concentrate pollutants. During the dry season, agricultural burning, though regulated, can contribute to localized smoke and particulate matter. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon months, limiting outdoor exertion during peak heat and avoiding areas with visible smoke. The monsoon months are generally favorable for outdoor activities, but vigilance regarding heavy rainfall and potential flooding is still advised. Maintaining indoor air quality through ventilation and air purification can be beneficial throughout the year, especially during periods of elevated pollution.