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Vittal, a town in the Dakshina Kannada district of Karnataka, India, occupies a geographically significant position within the Western Ghats foothills. Located at coordinates 12.7660°N, 75.1220°E, the town’s terrain is characterised by undulating hills and fertile plains, typical of the region’s transition zone. The Netravati River flows nearby, influencing local humidity and potentially contributing to temperature inversions during calmer periods. Vittal’s elevation, approximately 118 meters above sea level, moderates temperatures but doesn’t fully escape the coastal climate. The surrounding landscape is dominated by areca nut plantations, rubber estates, and paddy fields, representing a significant agricultural economy. While not a major industrial hub itself, Vittal is situated within reach of industrial activity in Mangalore and other coastal cities, which can contribute to regional pollution transport. The urban-rural gradient is pronounced; Vittal serves as a market town for surrounding villages, experiencing increased vehicular traffic and localised emissions. Dust from unpaved roads and agricultural practices also contribute to particulate matter. The town’s location within a valley can trap pollutants, exacerbating air quality issues, particularly during periods of low wind speed. Understanding this interplay of geography and activity is crucial for addressing Vittal’s air quality challenges.

Vittal experiences a tropical monsoon climate, dictating a distinct wet and dry season that heavily influences air quality. The southwest monsoon, typically arriving in June and lasting until September, brings heavy rainfall which naturally scrubs the air, leading to a temporary improvement in air quality. However, increased humidity can also foster mould growth, impacting respiratory health. Post-monsoon, from October to November, sees a gradual increase in pollution as dust settles and agricultural burning becomes more common, preparing fields for the next crop. This period often experiences stagnant air, trapping pollutants. The dry season, from December to May, presents the most challenging air quality conditions. Lower rainfall means pollutants accumulate, and higher temperatures contribute to ground-level ozone formation. January and February are often the clearest months, but March and April see a significant rise in particulate matter due to agricultural fires and increased dust from drier conditions. Sensitive groups – children, the elderly, and those with respiratory illnesses – should limit outdoor activity during the dry season, particularly in April and May. Wearing masks and monitoring health are advised. Wind patterns, often light and variable, play a crucial role in pollutant dispersion, or lack thereof.