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Bua Yai, nestled within Nakhon Ratchasima Province in northeastern Thailand (Isan), occupies a relatively flat landscape characteristic of the Korat Plateau. Its coordinates, 15.5840° N, 102.4186° E, place it inland, approximately 250 kilometers east-northeast of Bangkok. The terrain is gently undulating, primarily composed of lateritic soils, supporting a predominantly agricultural economy. The surrounding region is dominated by rice paddies, cassava plantations, and increasingly, rubber tree cultivation. While no major rivers traverse the city itself, Bua Yai benefits from irrigation schemes drawing water from the Mun River, located to the south. The urban-rural gradient is pronounced; Bua Yai functions as a district center, serving a large rural hinterland. This close proximity to agricultural activities significantly influences local air quality, particularly during land preparation and post-harvest burning. The lack of significant topographical features limits natural air dispersion. Furthermore, increasing road traffic associated with Bua Yai’s growing role as a regional transport hub contributes to localised pollution. The city’s position within a broader agricultural belt, coupled with its flat topography, creates conditions conducive to pollutant accumulation, especially during periods of atmospheric stability. The prevailing winds, influenced by the seasonal monsoon patterns, play a crucial role in pollutant transport and dispersion.

Bua Yai experiences a distinct wet and dry season, profoundly impacting air quality. The dry season, typically from November to April, sees a marked deterioration in air quality. Cooler temperatures and reduced rainfall lead to increased atmospheric stability, trapping pollutants from agricultural burning – a common practice for land clearing after the rice harvest – and vehicle emissions. January and February are often the months with the poorest air quality. The hot season, peaking in March and April, exacerbates the problem through increased evaporation and dust suspension. The arrival of the southwest monsoon in May brings a dramatic improvement. Heavy rainfall effectively washes pollutants from the atmosphere, and increased wind speeds enhance dispersion. Air quality remains generally good throughout the wet season (May-October), although localised pollution from traffic can still be present. However, even during the monsoon, periods of calm can lead to temporary build-ups of pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the dry season, particularly in January-April. Wearing masks can provide some protection. Monitoring weather forecasts for wind direction and avoiding areas near agricultural burning are also advisable.