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Ban Bang Muang, nestled in Nonthaburi province, Thailand, occupies a strategically important position within the Bangkok Metropolitan Region (BMR). Located approximately 20 kilometers northeast of central Bangkok, its coordinates (13.8474° N, 100.4167° E) place it on relatively flat terrain, characteristic of the Chao Phraya River basin. The surrounding landscape is a blend of urban development and agricultural land, transitioning from the dense urban fabric of the BMR to more rural areas further out. The city’s proximity to the Chao Phraya River, while providing a vital water source and transportation route, can also contribute to localized humidity and stagnant air conditions, particularly during periods of low wind. Ban Bang Muang sits at a low elevation, generally below 10 meters above sea level, which exacerbates the trapping of pollutants near the ground. The area is bordered by agricultural zones, primarily rice paddies and fruit orchards, which, while generally beneficial, can occasionally contribute to particulate matter through seasonal burning practices, although regulations are increasingly enforced. The urban–rural gradient is relatively sharp, with the city experiencing a rapid shift from residential areas to agricultural fields. The BMR’s industrial belts, concentrated further west and south, exert a significant influence on Ban Bang Muang’s air quality, with pollutants transported by prevailing winds. The city’s role as a commuter hub, connecting Bangkok to surrounding provinces, also contributes to traffic-related emissions, a key factor in its air quality profile.

Ban Bang Muang’s air quality follows a distinct seasonal pattern dictated by Thailand’s tropical climate. The dry season, typically spanning from November to April, often presents the most challenging conditions. Reduced rainfall and lower humidity lead to increased particulate matter concentrations, as dust and pollutants remain suspended in the air for longer periods. Temperature inversions, common during this period, trap cooler air near the ground, further hindering pollutant dispersion. March and April frequently experience the highest levels of concern, coinciding with the hottest months and increased agricultural burning in surrounding areas, although enforcement efforts are ongoing. The monsoon season, from May to October, brings relief with increased rainfall and higher humidity, naturally cleansing the atmosphere and dispersing pollutants. However, the onset of the monsoon can be marked by periods of heavy fog, particularly in the early months, which can temporarily reduce visibility and trap pollutants close to the ground. Wind patterns shift during the monsoon, generally becoming more prevalent from the southwest, which can bring in pollutants from industrial areas to the west. The shoulder seasons (May and October) are typically transitional, with fluctuating conditions. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak pollution periods and wearing appropriate masks. Maintaining indoor air quality through ventilation and air purifiers is also advisable.