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Kidangazhi, nestled in the Thrissur district of Kerala, India, occupies a geographically significant position along the Arabian Sea coast. Its coordinates (11.0333° N, 76.1000° E) place it within a predominantly low-lying coastal plain, characterized by fertile alluvial soils deposited by the Puzha River and its tributaries. The terrain is gently undulating, transitioning from sandy beaches to inland agricultural lands, creating a subtle urban–rural gradient. The proximity to the Arabian Sea exerts a considerable influence on the local climate and, consequently, air quality. Prevailing winds, often originating over the sea, can introduce marine aerosols and influence pollutant dispersion. The surrounding landscape is a mosaic of coconut groves, rice paddies, and small-scale farms, typical of Kerala’s agricultural heartland. While Kidangazhi itself is a relatively small urban center, it benefits from its connection to the larger Thrissur metropolitan area, which includes industrial zones and transportation corridors. The elevation is minimal, rarely exceeding 20 meters above sea level, which can exacerbate the trapping of pollutants during periods of temperature inversion, particularly during cooler months. The coastal location also means the city is susceptible to sea breezes, which can both dilute and concentrate pollutants depending on atmospheric stability. The region's dense vegetation generally contributes to air purification, but agricultural practices, including burning of crop residue (though increasingly regulated), can occasionally introduce localized pollution events. The Puzha River acts as a drainage artery, potentially carrying pollutants from upstream areas, impacting water and air quality.

Kidangazhi’s tropical climate dictates a distinct wet and dry season pattern, profoundly impacting air quality. The southwest monsoon, typically spanning June to September, brings torrential rainfall and strong winds, effectively flushing the atmosphere of accumulated pollutants. This period generally sees the best air quality, with frequent rain showers acting as a natural cleansing mechanism. However, the onset of the monsoon can be accompanied by increased dust from wind-blown soil, particularly in the initial weeks. The dry season, from October to May, presents a different challenge. During these months, particularly November to February, cooler nighttime temperatures can lead to temperature inversions, where a layer of warm air traps cooler air near the ground, preventing vertical mixing and concentrating pollutants. Fog, common during these months, further reduces visibility and exacerbates this effect. March and April often experience heightened temperatures and reduced rainfall, potentially leading to increased levels of particulate matter from agricultural activities and vehicle emissions. The summer months (April-May) can be uncomfortable for those with respiratory sensitivities. The coastal location means sea breezes play a crucial role; strong breezes can disperse pollutants, while calmer periods allow them to accumulate. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should limit strenuous outdoor activity during the cooler, calmer months (November-February) and monitor local air quality reports. Increased humidity throughout the year can also exacerbate respiratory issues for some individuals.