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Kattiyeri, a municipality nestled within the Kannur district of Kerala, India, occupies a unique geographic position. Located at 11.8764°N latitude and 75.8542°E longitude, the town is characterized by relatively flat terrain, typical of the coastal plains of Kerala, with an elevation generally below 10 meters. This low-lying landscape contributes to limited natural dispersion of pollutants. The Arabian Sea lies just a few kilometers west, influencing local humidity and wind patterns, but offering limited flushing of air pollutants due to prevailing wind directions. Kattiyeri is surrounded by a mosaic of coconut plantations, paddy fields, and increasingly, residential and commercial development. While not a major industrial hub itself, its proximity to larger industrial areas within Kannur district, particularly those related to beedi (hand-rolled cigarette) manufacturing and small-scale tile production, introduces potential sources of particulate matter and gaseous pollutants. The urban-rural gradient is fairly sharp, with dense settlement concentrated around the town center and rapidly transitioning to agricultural land. This proximity to agricultural practices introduces seasonal biomass burning, a significant contributor to localised air pollution. The dense vegetation, while beneficial for carbon sequestration, can also trap pollutants under stable atmospheric conditions, exacerbating air quality issues. Understanding this interplay of coastal influence, agricultural practices, and regional industrial activity is crucial for assessing Kattiyeri’s air quality.

Kattiyeri experiences a tropical climate, broadly defined by wet and dry seasons rather than traditional four seasons. Air quality generally improves during the Southwest Monsoon (June-September) as heavy rainfall effectively washes away particulate matter and increased humidity suppresses dust. However, this period can also see increased fungal spores impacting respiratory health. The post-monsoon season (October-November) often experiences calmer winds and increased humidity, leading to a build-up of pollutants, particularly from localised sources like vehicle emissions and biomass burning from agricultural residue. The dry season (December-February) is typically the period of poorest air quality. Lower humidity and stable atmospheric conditions promote the accumulation of pollutants, and increased use of domestic heating contributes to localised smoke. January and February are months to be particularly cautious about outdoor activity for sensitive groups. The pre-monsoon season (March-May) sees rising temperatures and increasing convective activity, offering some temporary relief through wind mixing, but also increasing the risk of dust storms. Individuals with asthma or other respiratory conditions should monitor conditions closely and limit strenuous outdoor activity during the dry season and periods of calm weather. Avoiding peak traffic hours and areas with known pollution sources is also advisable.