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Perunturuttu, a municipality in Kerala, India, is nestled within the verdant landscape of the Malabar Coast. Located at 9.6333°N latitude and 76.5667°E longitude, the town occupies a relatively low-lying area, typical of Kerala’s coastal plains, with an elevation generally under 10 meters. This proximity to the Arabian Sea exerts a significant influence on the local climate and, consequently, air quality. The surrounding terrain is characterised by a dense network of backwaters, canals, and paddy fields, a defining feature of Kerala’s geography. Perunturuttu isn’t a major industrial hub, but benefits from, and is impacted by, the broader industrial activity concentrated in nearby regions like Kochi and Kozhikode. The urban-rural gradient is quite sharp; the town itself is relatively compact, quickly transitioning into agricultural land dominated by rice cultivation and coconut plantations. This agricultural activity contributes to localized particulate matter from biomass burning during land preparation and harvesting. The coastal location means sea breezes play a crucial role in dispersing pollutants, but can also trap them under certain meteorological conditions. The relatively flat terrain limits natural ventilation, potentially exacerbating pollution episodes. Understanding this interplay of coastal influences, agricultural practices, and regional industrial emissions is key to assessing Perunturuttu’s air quality challenges.

Perunturuttu experiences a tropical climate, with distinct wet and dry seasons dictating air quality patterns. The southwest monsoon, typically arriving in June and lasting until September, brings heavy rainfall which effectively washes particulate matter from the air, resulting in generally improved air quality during these months. However, increased humidity can also foster mould growth, impacting respiratory health. October to February constitutes the drier season, marked by lower rainfall and calmer winds. This period often sees a build-up of pollutants, particularly from localized sources like vehicle emissions and biomass burning in agricultural areas. January and February are often the months with the least atmospheric cleansing. March to May is the hottest period, preceding the monsoon, and can experience stagnant air conditions, leading to increased concentrations of ground-level ozone and particulate matter. Temperature inversions, common during these calm periods, trap pollutants near the surface. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the drier months, especially in the late afternoon when ozone levels tend to peak. Monitoring local weather patterns and avoiding strenuous activity on still, hot days is advisable.