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Toboali, the capital of Kepulauan Bangka Belitung province, occupies a strategically important coastal location on the island of Bangka, Indonesia. Situated at approximately -2.9997° latitude and 106.4656° longitude, the city’s geography is defined by a gently sloping terrain transitioning from the coastline to low-lying hills inland. The surrounding landscape is a mosaic of coastal mangroves, rubber and palm oil plantations, and small-scale mining operations, particularly tin mining which historically has been a dominant industry in the region. Toboali’s proximity to the Bangka Strait significantly influences its climate and, consequently, its air quality. The strait provides a pathway for sea breezes, which can help disperse pollutants, but also introduces maritime aerosols. The urban fabric of Toboali is relatively compact, characterized by a mix of traditional wooden houses and more modern concrete structures, reflecting a gradual shift in development. The urban–rural gradient is relatively sharp, with agricultural land and smaller villages quickly surrounding the city limits. Elevation is generally low, rarely exceeding 50 meters above sea level, which can exacerbate the trapping of pollutants during periods of stable atmospheric conditions. The presence of tin smelters and processing facilities, though increasingly regulated, contributes to localized air pollution sources. The island’s geology, rich in tin deposits, also influences soil composition and potential dust emissions, further impacting the air quality profile of Toboali.

Toboali experiences a tropical climate with distinct wet and dry seasons, significantly impacting its air quality patterns. The wet season, typically spanning from October to April, brings increased rainfall and higher humidity. While the rain helps to cleanse the atmosphere by removing particulate matter, the increased humidity can also contribute to the formation of secondary pollutants like ozone, particularly during periods of intense sunlight. The dry season, from May to September, is characterized by lower rainfall and higher temperatures. This often leads to a build-up of pollutants, especially during periods of stagnant air. Temperature inversions, where a layer of warm air traps cooler air near the ground, are more frequent during the dry season, preventing the vertical dispersion of pollutants from industrial sources and vehicle emissions. Sea breezes, while generally beneficial, can be weaker during the dry season, further reducing air circulation. Months like July and August often see a noticeable increase in localized pollution due to reduced rainfall and stable atmospheric conditions. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during these periods, limiting outdoor activity and avoiding areas near industrial zones. During the wet season, while overall air quality tends to be better, individuals with allergies may experience increased discomfort due to higher pollen and mold spore counts. Maintaining indoor air quality through proper ventilation and air filtration is crucial year-round.