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Mūdbidri, nestled in the Dakshina Kannada district of Karnataka, India, occupies a unique geographic position within the Western Ghats foothills. Located at coordinates 12.9101°N, 75.0030°E, the town’s terrain is predominantly undulating, characterized by lateritic hills and fertile plains. This landscape significantly influences local air quality. The surrounding region is a mosaic of coconut plantations, paddy fields, and areca nut groves, typical of the coastal Karnataka agricultural belt. While not heavily industrialized *within* Mūdbidri itself, its proximity to Mangalore, a major port city and industrial hub approximately 30km to the northwest, introduces a degree of regional pollution transport. The Netravati River flows nearby, offering some natural dispersion, but also potentially trapping pollutants during temperature inversions. The urban-rural gradient is relatively sharp; Mūdbidri represents a significant population center amidst a largely agrarian landscape. This creates localized pollution hotspots around market areas and transport corridors. The elevation, averaging around 100-150m above sea level, contributes to the formation of localized microclimates that can exacerbate pollution events. Dust from unpaved roads and agricultural activities also contributes to particulate matter levels, particularly during drier periods. The town’s position within a rain shadow area of the Western Ghats impacts rainfall patterns and thus, pollutant washout.

Mūdbidri experiences a distinct wet and dry season, heavily influencing air quality. The southwest monsoon, typically arriving in June and lasting until September, brings substantial rainfall, effectively scrubbing the atmosphere of particulate matter and gaseous pollutants. This period generally sees the lowest pollution levels, making it the most favourable time for outdoor activities. However, increased humidity can also foster mold growth, impacting respiratory health. Post-monsoon, from October to November, sees a gradual increase in pollution as dust settles and agricultural burning commences, preparing fields for the next crop. December to February constitutes the driest period, with stagnant air and temperature inversions frequently trapping pollutants near the ground. This is when air quality is typically at its worst, particularly in the mornings. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor exposure during these months. March to May sees rising temperatures and increased dust levels, further degrading air quality before the monsoon’s arrival. Wind patterns shift during these months, potentially bringing pollutants from nearby industrial areas. Avoiding strenuous outdoor activity during peak heat and dry periods is advisable.