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Ye, situated in Mon State, Myanmar (coordinates 15.2467° N, 97.8556° E), occupies a geographically significant position within the country’s southern coastal plains. The city’s terrain is predominantly low-lying, gently sloping towards the Gulf of Mottama, a branch of the Andaman Sea. This proximity to the sea influences local weather patterns and, crucially, the dispersion of air pollutants. Ye is surrounded by a mosaic of agricultural land, primarily rice paddies and rubber plantations, interspersed with pockets of mangrove forests along the coastline. The urban fabric of Ye is relatively compact, reflecting its smaller population of approximately 34,430. The urban–rural gradient is gradual, with agricultural activities seamlessly blending into the city’s periphery. Further inland, the landscape rises slightly, transitioning into rolling hills and eventually the more rugged terrain of the Tenasserim Hills. This topography can contribute to localized air stagnation, particularly during periods of calm weather. While Ye isn't directly adjacent to major industrial belts, it serves as a regional trading hub, and increasing transportation activity, including trucks carrying agricultural produce and goods, contributes to localized emissions. The coastal location also means the city is susceptible to salt spray and potential impacts from sea-borne pollutants, though these are generally less significant than land-based sources. The surrounding landscape, dominated by agriculture, introduces biogenic volatile organic compounds (BVOCs) which can react with other pollutants in sunlight, impacting local air quality.

Ye’s tropical monsoon climate dictates a distinct seasonal pattern in air quality. The wet season, typically spanning from May to October, brings frequent rainfall and high humidity, generally leading to improved air quality as precipitation washes away particulate matter and dilutes gaseous pollutants. Strong monsoon winds also aid in dispersing pollutants, preventing significant build-up. However, heavy rainfall can also lead to increased soil erosion and runoff, carrying dust and sediment into the air. The dry season, from November to April, presents a contrasting scenario. Reduced rainfall and calmer winds often result in temperature inversions, where a layer of warm air traps cooler air near the ground, hindering vertical mixing and allowing pollutants to accumulate. Fog, common during the cooler months of December and January, further exacerbates this issue by reducing visibility and trapping pollutants close to the surface. Agricultural burning, a common practice for land clearing and crop residue disposal, is most prevalent towards the end of the dry season and the beginning of the wet season (March-May), significantly contributing to particulate matter pollution. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during these periods, limiting outdoor activity and avoiding areas with visible smoke. The transition months (April-May and October-November) often experience fluctuating air quality, influenced by shifting wind patterns and the onset or retreat of the monsoon.