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Ban Lam Sam Kaeo, nestled within Pathum Thani province, Thailand, occupies a strategically important position in the Bangkok Metropolitan Region (BMR). Located approximately 20 kilometers northeast of central Bangkok, its coordinates (13.9728° N, 100.6511° E) place it on relatively flat terrain, characteristic of the Chao Phraya River basin. The surrounding landscape is a blend of agricultural land – rice paddies and fruit orchards are common – transitioning into suburban development as it approaches the urban sprawl of Bangkok. This urban–rural gradient is a key factor influencing air quality. The city itself is a rapidly developing municipality, exhibiting a mix of traditional Thai housing and modern residential areas, indicating ongoing population growth and associated construction activities. While not directly adjacent to the Chao Phraya River, the proximity to its floodplain influences local humidity and temperature patterns. To the east, the landscape gradually rises, though gently, towards higher ground, impacting prevailing wind patterns. The region’s position within the BMR means it’s susceptible to pollution transported from Bangkok and surrounding industrial zones, particularly along the eastern corridor. Agricultural practices, including the burning of crop residue (though increasingly regulated), can also contribute to localized air pollution events. The relatively low elevation (around 10-20 meters above sea level) contributes to temperature inversions, particularly during the cooler months, trapping pollutants closer to the ground. The surrounding agricultural belt and the proximity to Bangkok’s industrial periphery create a complex interplay of factors affecting air quality in Ban Lam Sam Kaeo.

Ban Lam Sam Kaeo’s air quality experiences a distinct seasonal cycle dictated by Thailand’s monsoon climate. The hot season (March-May) typically sees drier conditions and increased temperatures, often leading to stagnant air and a propensity for temperature inversions, especially during the early morning hours. These inversions trap pollutants released from Bangkok and local sources, potentially exacerbating respiratory issues. The transition into the rainy season (June-October) brings relief as monsoon winds disperse accumulated pollutants, leading to improved air quality. However, heavy rainfall can also mobilise dust and particulate matter, temporarily degrading air quality. November to February constitutes the cool season, characterized by cooler temperatures and calmer winds. While generally offering better air quality than the hot season, the lack of strong winds can still allow pollutants to accumulate, particularly during periods of fog. Agricultural burning, though increasingly controlled, can also contribute to localized pollution spikes during this period. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the hot season and be mindful of potential pollution episodes during the cool season. Outdoor activities are generally more favourable during the rainy season, although vigilance regarding localised dust events is still advised. The interplay of temperature, wind patterns, and agricultural practices creates a dynamic air quality profile throughout the year, requiring adaptive strategies for public health protection.