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Dharmadam, a coastal town in Kerala’s Kannur district, presents a unique geographic context influencing its air quality. Situated at 11.7935°N, 75.4709°E, the town lies close to the Arabian Sea, benefitting from coastal breezes but also vulnerable to marine aerosol contributions to particulate matter. The terrain is relatively flat, typical of Kerala’s coastal plains, with a gentle slope inland towards the Western Ghats. This proximity to the mountains influences local wind patterns, creating localized convergence zones. Dharmadam’s population of approximately 30,804 is dispersed across a largely rural landscape, though urbanisation is increasing. The surrounding area is characterised by coconut plantations, paddy fields, and a network of backwaters. While Dharmadam isn’t a major industrial hub, regional industrial activity in nearby Kannur and Kozhikode can contribute to transboundary pollution. The urban-rural gradient is relatively sharp, with agricultural practices like crop burning potentially impacting localised air quality, particularly during harvest seasons. The dense vegetation offers some natural filtration, but the coastal location means pollutants can be readily dispersed or concentrated depending on monsoon winds and weather systems. Understanding this interplay of coastal, agricultural, and regional influences is crucial for assessing Dharmadam’s air quality.

Dharmadam’s air quality follows a distinct seasonal pattern dictated by the monsoon and inter-monsoon periods. The southwest monsoon (June-September) generally brings cleaner air due to rainfall scavenging pollutants and increased wind speeds dispersing emissions. However, high humidity can also promote the formation of mould spores, impacting respiratory health. October-November sees a transition period with calmer winds and increased biomass burning from agricultural practices, leading to a temporary increase in particulate matter. The dry season (December-February) is often the period of poorest air quality. Lower rainfall means pollutants accumulate, and temperature inversions, common during cooler months, trap pollutants near the ground. Wind speeds are generally lower, reducing dispersion. March-May experiences rising temperatures and pre-monsoon showers, offering some relief, but dust from construction and road traffic becomes more prominent. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the dry season, particularly in December-February. Monitoring local weather patterns and avoiding peak pollution times is advisable. The monsoon, while bringing rain, can also increase the risk of waterborne diseases, so precautions are necessary.