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Maroli, a small coastal town in the Valsad district of Gujarat, India, occupies a unique geographic position. Located at 21.0240°N, 72.8890°E, the town is nestled along the Arabian Sea coastline, characterized by a relatively flat terrain typical of the Gujarat plains. The surrounding landscape is a mix of coastal wetlands, agricultural fields – primarily rice and sugarcane – and increasingly, small-scale industrial activity. Maroli’s elevation is minimal, contributing to limited natural dispersion of pollutants. The town’s proximity to larger industrial hubs like Valsad and Vapi, approximately 15-20km inland, significantly impacts its air quality. These industrial areas generate emissions from chemical manufacturing, textiles, and processing plants. The urban-rural gradient is pronounced; Maroli itself retains a semi-rural character, but is increasingly influenced by the expanding industrial belt. The coastal location introduces the influence of sea breezes, which can both dilute and transport pollutants depending on prevailing wind directions. The lack of significant topographical features hinders the flushing out of trapped pollutants, particularly during calm weather conditions. This combination of factors creates a localized air quality vulnerability, exacerbated by seasonal weather patterns and regional industrial emissions.

Maroli’s air quality follows a distinct seasonal pattern. The post-monsoon months (October-November) often see a temporary improvement as monsoon rains have washed away accumulated pollutants. However, this is short-lived. The winter months (December-February) are typically the most polluted, characterized by cooler temperatures and frequent temperature inversions. These inversions trap pollutants near the ground, leading to higher concentrations of particulate matter and gaseous pollutants from nearby industries and domestic sources. Light winds during this period further exacerbate the situation. The pre-monsoon months (March-May) witness rising temperatures and dust storms, contributing to increased levels of coarse particulate matter. The arrival of the southwest monsoon (June-September) brings relief, as heavy rainfall effectively washes away pollutants and increases atmospheric mixing. However, increased humidity can also promote the formation of secondary pollutants. For individuals with respiratory conditions, avoiding outdoor activity during the winter months and peak pre-monsoon periods is advisable. Children and the elderly are particularly vulnerable. Monitoring local conditions and limiting strenuous activity on poor air quality days is crucial for maintaining health.