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Kampong Cham, situated along the vital Mekong River in eastern Cambodia, represents a quintessential provincial capital where urban development meets extensive agricultural landscapes. The city occupies a strategic position on the river's western bank, approximately 124 kilometers northeast of Phnom Penh, serving as a crucial transportation and commercial hub for Cambodia's eastern provinces. With an elevation of just 20 meters above sea level, the terrain is predominantly flat alluvial plains, part of the broader Mekong Lowlands that characterize this region. This low-lying topography significantly influences air quality by limiting natural ventilation and allowing pollutants to accumulate, particularly during dry periods when temperature inversions become common. The city's urban-rural gradient is pronounced, with compact urban centers transitioning rapidly into vast rubber plantations, rice paddies, and mixed agricultural zones that dominate the surrounding landscape. Proximity to the Mekong River provides some moderating effects but also creates microclimates where moisture can interact with emissions. The region functions as both an agricultural processing zone and transportation corridor, with National Road 7 connecting to Vietnam's border, ensuring constant vehicle traffic. This geographic positioning means Kampong Cham experiences pollution from both localized urban sources and regional agricultural activities, creating complex air quality challenges unique to Cambodia's eastern plains.

Kampong Cham's tropical wet-and-dry climate creates distinct seasonal patterns in air quality, with pollution peaking dramatically during the dry season from November through April. The most hazardous months are January through April, when northeast monsoon winds bring dry continental air from mainland Asia, suppressing rainfall and allowing pollutants to accumulate. During these months, temperature inversions frequently trap emissions near the ground, while agricultural burning for land clearance and domestic biomass burning for cooking intensify particulate pollution. Sensitive groups should minimize outdoor activities during these peak months, especially in morning hours when inversions are strongest. The wet season from May to October brings relief as southwest monsoon winds from the Gulf of Thailand deliver cleansing rains that wash pollutants from the atmosphere. June through September offers the cleanest air for outdoor activities, though high humidity can make heat stress a concern. Transitional months of May and October see improving conditions as monsoon patterns shift. Fog occasionally develops in cooler dry-season mornings, mixing with pollution to create hazardous visibility and respiratory conditions. The seasonal narrative is one of stark contrast between dangerously polluted dry months and relatively clean wet months, requiring residents and visitors to adapt activities accordingly throughout the year.