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Kēralasshēri, nestled in the Thrissur district of Kerala, India, occupies a geographically significant position within the state’s verdant landscape. Located at approximately 10.8250° N latitude and 76.5000° E longitude, the town sits at a modest elevation, contributing to a relatively mild climate. The surrounding terrain is characterized by undulating hills and fertile plains, typical of Kerala’s central region. This area is predominantly agricultural, with rice paddies, coconut groves, and spice plantations dominating the rural backdrop. The proximity to the Puzha River, a vital waterway, influences local microclimates and provides a source of irrigation for the surrounding farmlands. While Kēralasshēri itself is a small town, it’s situated within a broader urban-rural gradient, transitioning from agricultural fields to the larger urban agglomeration of Thrissur, approximately 25 kilometers away. This proximity means that while Kēralasshēri experiences less direct industrial pollution than Thrissur, it can still be affected by pollutants transported from the larger urban center. The prevailing winds, generally southwesterly during the monsoon season and northwesterly during the dry season, play a crucial role in dispersing or concentrating air pollutants. The dense vegetation surrounding the town acts as a natural filter, absorbing some pollutants, but also contributing to humidity which can trap particulate matter under certain atmospheric conditions. The relatively low elevation and humid climate, combined with the agricultural landscape, create a unique set of factors influencing air quality in Kēralasshēri.

Kēralasshēri’s air quality follows a distinct seasonal pattern dictated by Kerala’s monsoon climate. The southwest monsoon, typically spanning June to September, brings heavy rainfall and strong winds, effectively flushing the atmosphere of accumulated pollutants. This period generally offers the best air quality, with frequent rain showers acting as a natural cleansing mechanism. However, during periods of prolonged rainfall, humidity can increase, potentially trapping finer particulate matter close to the ground. The post-monsoon season (October-November) sees a gradual decrease in rainfall and a slight increase in temperature. Agricultural burning, a common practice to clear fields for the next planting season, can contribute to localized spikes in smoke and particulate matter during this time. The dry season (December-March) often presents the most challenging period for air quality. Reduced rainfall, calmer winds, and cooler nighttime temperatures can lead to temperature inversions, trapping pollutants near the ground. Fog, particularly in the early morning hours, further exacerbates this issue by limiting atmospheric mixing. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during these months, limiting outdoor activity during peak pollution hours. The pre-monsoon season (April-May) is characterized by rising temperatures and increasing humidity, with occasional dust storms originating from the northern plains impacting air quality. Overall, the monsoon months offer respite, while the dry season demands heightened awareness and precautionary measures to protect respiratory health.