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Trikonavattam, nestled within the verdant landscape of Kerala, India (8.9000° N, 76.6500° E), is a municipality of approximately 61,287 residents. The city’s name, meaning ‘three corners’, hints at its location at the confluence of geographical features. Situated in the midlands of Kerala, Trikonavattam isn’t directly coastal, but benefits from the moderating influence of the Arabian Sea approximately 30-40km to the west. The terrain is gently undulating, a characteristic of the Kerala landscape, transitioning from paddy fields and rubber plantations in the lower areas to slightly higher ground supporting coconut and areca nut cultivation. This agricultural dominance significantly impacts local air quality, with seasonal burning of agricultural waste being a key contributor. The surrounding landscape is densely vegetated, offering some natural filtration, but the increasing urban sprawl and associated vehicular emissions are becoming more prominent. Trikonavattam isn’t a major industrial hub, but smaller-scale processing of agricultural products and local brick kilns contribute to particulate matter. The urban-rural gradient is relatively sharp, with quickly transitioning land use patterns as one moves outwards from the municipal centre. This proximity to agricultural zones and the lack of significant wind corridors can trap pollutants, exacerbating air quality issues.

Trikonavattam experiences a tropical climate, with distinct wet and dry seasons heavily influencing air quality. The southwest monsoon, typically arriving in June and lasting until September, initially offers a respite from pollution as heavy rainfall washes particulate matter from the atmosphere. However, increased humidity can also foster mould growth, impacting respiratory health. October to February represents the drier season, with lower rainfall and calmer winds. This period often sees a build-up of pollutants, particularly from agricultural burning post-harvest and increased vehicular traffic. January and February are generally the least favourable months for outdoor activity for those with respiratory sensitivities. March to May, the hottest period, experiences increased dust and ozone formation due to higher temperatures and sunlight. Temperature inversions, common during the cooler, drier months, trap pollutants near ground level, worsening air quality. Fog, prevalent during the transition periods, can also exacerbate particulate matter concentrations. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during these peak pollution periods and consider using N95 masks when necessary. Monitoring local weather patterns and avoiding peak traffic hours are also advisable.