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Pulimel, a small town nestled within the verdant landscape of Kerala, India, occupies a low-lying position at approximately 9.3000°N, 76.5833°E. Its geography is fundamentally shaped by the coastal plains of the Arabian Sea, though Pulimel itself is not directly on the coast, lying inland within the Alappuzha district. The terrain is largely flat, characteristic of the Kerala coastal belt, interspersed with a network of backwaters, canals, and paddy fields. This intricate hydrological system, while ecologically vital, can contribute to localised humidity and stagnant air conditions. Surrounding Pulimel are extensive coconut plantations and agricultural lands, typical of Kerala’s agrarian economy. While not a major industrial hub, the region experiences some localised industrial activity related to coir processing and small-scale manufacturing. The urban-rural gradient is pronounced; Pulimel represents a transition zone between denser settlements and the more rural, agricultural hinterland. This proximity to agricultural practices introduces potential sources of particulate matter from biomass burning and fertilizer use. The relatively flat topography limits natural dispersion of pollutants, making the town susceptible to air quality issues, particularly during periods of calm weather. The influence of the monsoon winds and seasonal rainfall patterns are critical factors in determining air quality dynamics.

Pulimel’s air quality follows a distinct seasonal pattern dictated by the monsoon cycle. The pre-monsoon months of March to May are typically the hottest and driest, leading to increased dust and particulate matter in the air, exacerbated by agricultural activities like harvesting and potential biomass burning. This period often sees a decline in air quality. The arrival of the Southwest Monsoon in June brings relief, with heavy rainfall effectively washing away pollutants and improving air quality significantly. This period, lasting until September, generally offers the cleanest air. However, increased humidity can also foster mould growth, impacting respiratory health. October and November mark a transition phase, with decreasing rainfall and a gradual build-up of pollutants. The Northeast Monsoon, though less intense, brings intermittent rainfall in December and January, offering temporary improvements. January to February are relatively dry, with stagnant air conditions potentially trapping pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the pre-monsoon months and periods of calm weather. Monitoring local weather patterns and avoiding peak traffic hours are also advisable. The monsoon season, particularly July and August, generally presents the most favourable conditions for outdoor activities.