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Nettappākkam, nestled in the Kancheepuram district of Tamil Nadu, India, occupies a geographically significant position within the Coromandel Coast region. Located at approximately 11.8663° N latitude and 79.6327° E longitude, the town’s terrain is predominantly flat, characteristic of the fertile plains of South India. Its proximity to the Bay of Bengal, roughly 30 kilometers to the east, influences local weather patterns and introduces a maritime element to the air. The surrounding landscape is a mosaic of agricultural fields – primarily rice paddies and vegetable farms – interspersed with small villages and pockets of scrubland. This agricultural activity, while vital to the regional economy, contributes to seasonal particulate matter, particularly during harvest periods when burning of crop residue is practiced. The urban–rural gradient around Nettappākkam is gradual; the town itself is relatively small, exhibiting a primarily rural character with emerging signs of urbanisation. It lies within a broader industrial belt extending along the Chennai-Kancheepuram corridor, though direct heavy industry within Nettappākkam itself is limited. The elevation is low, averaging around 15 meters above sea level, which can exacerbate the trapping of pollutants, especially during periods of temperature inversion. The town’s location within a densely populated state and its connectivity to major transportation routes also contribute to vehicular emissions, a growing concern for air quality. The flat topography limits natural ventilation, potentially hindering the dispersion of pollutants released from nearby areas.

Nettappākkam experiences a tropical climate with distinct wet and dry seasons, significantly impacting its air quality profile. The dry season, typically spanning from March to May, often witnesses a noticeable increase in particulate matter. This is largely attributable to increased dust from agricultural activities, including land preparation and harvesting, combined with lower rainfall to wash pollutants from the atmosphere. Temperature inversions, common during these months, trap pollutants near the ground, worsening conditions. The monsoon season, from June to September, brings relief as heavy rainfall effectively clears the air, reducing both particulate and gaseous pollutants. However, the onset of the monsoon can initially be accompanied by increased humidity, which can exacerbate respiratory issues for sensitive individuals. October and November represent a transitional period, with decreasing rainfall and gradually increasing temperatures, potentially leading to a slow return of elevated pollution levels. Fog, particularly in the cooler months (December-February), can also trap pollutants, reducing visibility and impacting air quality. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season and periods of fog, limiting prolonged outdoor exposure and considering the use of air purifiers indoors. Agricultural workers should be mindful of dust exposure and utilize appropriate protective gear. Maintaining awareness of local weather conditions and air quality forecasts is crucial for informed decision-making regarding outdoor activities.