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Phon, nestled within the Khon Kaen province of Thailand, occupies a central position in the Northeast, or Isan region. Situated at coordinates 15.8160, 102.5998, the town’s geography is characterised by relatively flat plains, typical of the Khorat Plateau. The elevation is modest, generally below 200 meters, contributing to limited natural dispersion of pollutants. Phon is not directly adjacent to major bodies of water, though it lies within a network of smaller streams and irrigation canals supporting the surrounding agricultural lands. The dominant landscape is intensely cultivated rice paddies, interspersed with cassava and sugarcane plantations. This agricultural focus is a key factor influencing air quality, particularly during the burning season. Khon Kaen city, a significant regional hub, lies approximately 25km to the southwest, creating an urban-rural gradient where pollutants from the larger city can impact Phon, especially under stagnant atmospheric conditions. The lack of significant topographical features – hills or mountains – hinders the flushing of airborne particles. Industrial activity is limited within Phon itself, but regional transport networks and the proximity to larger industrial zones in Khon Kaen contribute to background pollution levels. The prevailing winds, influenced by the monsoon patterns, play a crucial role in pollutant transport and dispersion.

Phon experiences a distinct wet and dry season, profoundly impacting air quality. The dry season, typically November to April, is the period of greatest concern. Agricultural burning, a common practice to clear land for the next planting cycle, releases substantial amounts of particulate matter (PM2.5 and PM10) into the atmosphere. This, combined with lower wind speeds and frequent temperature inversions – where a layer of warm air traps cooler, polluted air near the ground – leads to significant pollution build-up. February and March are often the worst months. The onset of the wet season in May brings relief, as rainfall effectively washes pollutants from the air. However, increased humidity can also promote the formation of secondary pollutants. The period from June to October generally sees improved air quality, though localised burning may still occur. During the wet season, mould spores can become more prevalent, impacting those with respiratory sensitivities. November sees a transition period with increasing dryness and a gradual return of agricultural activity. Sensitive groups – children, the elderly, and those with pre-existing respiratory or cardiovascular conditions – should limit outdoor exertion during the dry season, particularly in February and March, and consider using air filtration indoors.