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Chum Phae, nestled within the Khon Kaen province of Thailand, occupies a relatively flat expanse of the Khorat Plateau, a region characterised by rolling plains and sandy soils. Its coordinates, 16.5443°N, 102.0992°E, place it firmly within the country’s northeastern Isan region. The terrain is gently undulating, lacking significant elevation changes, which impacts air dispersion. The city’s population of approximately 31,597 reflects its status as a district centre, serving a largely agricultural hinterland. Chum Phae isn’t directly adjacent to major bodies of water, though it’s influenced by seasonal rainfall patterns and smaller waterways that drain across the plateau. Surrounding the city are extensive rice paddies and other agricultural lands, a key contributor to potential air quality issues through seasonal burning practices. While not a major industrial hub itself, Chum Phae’s proximity to Khon Kaen city, a growing regional centre with associated industrial activity, means it can experience pollutant transport. The urban-rural gradient is pronounced; moving outwards from the town centre, air quality generally improves, but is still susceptible to regional agricultural influences. This geographic setting dictates that air quality challenges are often linked to local agricultural practices and regional meteorological conditions, rather than concentrated industrial emissions within Chum Phae itself.

Chum Phae experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, typically from November to April, presents the most challenging conditions. Cooler temperatures and reduced rainfall lead to increased pollutant concentrations, exacerbated by agricultural burning to prepare fields for the next planting cycle. February and March are often the months with the poorest air quality, as farmers clear land. Temperature inversions, common during the cool dry season mornings, trap pollutants near the ground. The onset of the wet season in May brings a significant improvement. Monsoon rains effectively wash pollutants from the atmosphere, and increased humidity suppresses dust. However, even during the wet season, localised pollution from traffic and small-scale burning can occur. September and October, as the monsoon weakens, can see a slight deterioration. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the peak of the dry season. Monitoring wind direction is crucial; winds from agricultural areas to the west and south can bring smoke into Chum Phae. Staying indoors with windows closed and using air purifiers are recommended during periods of poor air quality.