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Kalliyasshēri, nestled in the Kannur district of Kerala, India, occupies a unique geographic position along the Arabian Sea coast. Situated at coordinates 11.9712°N, 75.3616°E, the city benefits from a relatively low elevation, contributing to a humid tropical climate. The terrain is characterized by a coastal plain, gradually rising inland towards the Western Ghats, a significant mountain range influencing regional weather patterns. Kalliyasshēri’s proximity to the sea introduces a constant supply of moisture and moderates temperatures, but also facilitates the transport of pollutants. The surrounding landscape is a mosaic of coconut plantations, paddy fields, and dense vegetation, typical of Kerala’s agricultural heartland. While not a major industrial hub itself, Kalliyasshēri is within reach of industrial areas further south, potentially contributing to long-range pollutant transport. The urban-rural gradient is pronounced; the city centre is relatively compact, transitioning quickly to rural agricultural lands. This proximity to agricultural practices introduces potential sources of particulate matter from biomass burning and fertilizer use. The coastal location means sea breezes play a crucial role in dispersing, or conversely, concentrating pollutants depending on meteorological conditions. Understanding this interplay is vital for assessing and mitigating air quality challenges.

Kalliyasshēri experiences a distinct wet and dry season, heavily influenced by the Southwest Monsoon. Air quality generally improves during the monsoon months (June-September) as heavy rainfall effectively washes away particulate matter and suppresses dust. However, increased humidity can also foster mold growth, impacting respiratory health. The post-monsoon season (October-November) sees a gradual return of drier conditions and a potential increase in localized pollution from agricultural activities like paddy harvesting and associated burning of crop residue. December to February represents the driest period, often characterized by calmer winds and temperature inversions, trapping pollutants closer to the ground. This is typically when air quality is poorest, particularly in the mornings. March to May sees rising temperatures and increased convective activity, which can help disperse pollutants, but also exacerbate ozone formation. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the dry season, especially in the mornings. Monitoring wind patterns is crucial; onshore breezes can bring in marine aerosols, while offshore breezes can concentrate land-based pollutants. Avoiding strenuous activity near roadways during peak traffic hours is also advisable.