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Aikaranad, a small town in Kerala, India (10.0002°N, 76.4550°E), is nestled within the coastal plains of the state’s Alappuzha district. Its geography is defined by a relatively flat terrain, typical of the Kerala coastline, with an elevation barely above sea level. This low-lying position makes it particularly susceptible to the influences of the Arabian Sea, experiencing high humidity and moderate temperatures year-round. The town is interwoven with a network of backwaters and canals, characteristic of this region, which, while ecologically significant, can also contribute to stagnant air conditions. Surrounding Aikaranad are lush paddy fields and coconut groves, representing a predominantly agricultural landscape. While not a major industrial hub itself, its proximity to larger towns like Alappuzha and Kollam means it’s within reach of industrial activity and associated emissions. The urban-rural gradient is quite sharp; the town itself is compact, quickly transitioning into rural agricultural areas. This proximity to agricultural practices introduces potential for seasonal biomass burning, impacting local air quality. The coastal location means sea breezes play a crucial role in dispersing pollutants, but these breezes can also carry saline particles inland. The dense vegetation offers some natural filtration, but its capacity is limited by the prevailing meteorological conditions and the scale of potential pollution sources.

Aikaranad’s air quality follows a pattern dictated by Kerala’s tropical climate, primarily defined by wet and dry seasons rather than traditional four seasons. The southwest monsoon, arriving in June and lasting until September, generally brings cleaner air. Heavy rainfall effectively washes away particulate matter, and increased wind speeds aid dispersion. However, the monsoon can also lead to increased humidity, fostering mould growth which can affect respiratory health. October to February constitutes the drier season, with calmer winds and increased temperatures. This period often sees a build-up of pollutants, particularly from localized sources like vehicle emissions and household cooking. January and February are typically the least favourable months for outdoor activity for those with respiratory sensitivities. March to May is the hottest and driest period, often experiencing temperature inversions, trapping pollutants near the ground. Biomass burning from agricultural practices after the harvest can exacerbate air quality during this time. Fog is infrequent but can occur during cooler mornings, trapping pollutants. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during the drier months and be mindful of potential irritants.