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Annakāttumūla, nestled in the Thrissur district of Kerala, India, occupies a geographically significant position within the state’s verdant landscape. Located at approximately 9.8575° N latitude and 76.4009° E longitude, the village sits within a region characterized by undulating terrain, a typical feature of Kerala’s Western Ghats foothills. The elevation is relatively modest, contributing to a generally mild climate. Annakāttumūla’s proximity to the Peringalkuthur River influences local humidity and microclimates, creating pockets of higher moisture content. The surrounding landscape is predominantly rural, a mosaic of rice paddies, coconut groves, and small-scale agricultural plots, typical of Kerala’s agrarian economy. This rural character creates a gradual urban–rural gradient, with the larger Thrissur city lying approximately 20 kilometers to the north, representing the closest significant urban centre. While Annakāttumūla itself is a small village, its location within a region experiencing increasing development means potential impacts from industrial activity and transportation in Thrissur can subtly affect air quality. The prevailing winds, generally southwesterly during the monsoon and northwesterly during the dry season, play a crucial role in dispersing or concentrating pollutants. The village’s terrain, with its gentle slopes and riverine influence, can create localized areas of stagnant air, particularly during periods of low wind speed, potentially exacerbating air quality issues. The surrounding agricultural practices, while largely traditional, can contribute to localized emissions from burning crop residue, though this is generally regulated.

Kerala’s tropical climate dictates a distinct wet and dry season pattern, profoundly influencing Annakāttumūla’s air quality. The southwest monsoon, typically spanning from June to September, brings torrential rainfall and high humidity, effectively cleansing the atmosphere and significantly reducing particulate matter. This period generally offers the best air quality, with frequent rainfall washing away pollutants and strong winds dispersing any lingering emissions. Conversely, the dry season (October to May) presents a more complex picture. While temperatures rise, the lack of consistent rainfall allows pollutants to accumulate. November and December often experience periods of fog, particularly in the mornings, which traps pollutants near the ground, creating localized episodes of poorer air quality. January and February are typically drier, with calmer winds, which can lead to stagnant air conditions and a build-up of pollutants from agricultural activities and any nearby industrial sources. The pre-monsoon months (March-May) are often the most challenging, with rising temperatures, reduced rainfall, and increased dust from agricultural practices. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during these months, limiting strenuous outdoor activity during peak pollution hours, typically in the early morning. The monsoon’s cleansing effect provides a natural respite, but even during this period, localized pollution from agricultural burning can occur. Overall, the monsoon season is the most favourable time for outdoor activities, while the pre-monsoon months require heightened awareness and preventative measures.