Ban Khlong Air Quality Index (AQI)

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Ban Khlong, nestled within Phitsanulok Province in north-central Thailand, occupies a relatively flat terrain typical of the Chao Phraya River basin. Situated at coordinates 16.8353, 100.2320, the town’s geography is fundamentally shaped by its proximity to the Nan River, a major tributary of the Chao Phraya. This riverine influence contributes to high humidity levels and, during the rainy season, potential for localised flooding. The surrounding landscape is predominantly agricultural, dominated by rice paddies, sugarcane plantations, and fruit orchards, reflecting Phitsanulok’s status as a significant agricultural province. While Ban Khlong itself is a smaller urban centre with a population of approximately 13,186, it’s positioned within a broader network of towns and cities along the river, creating a complex urban-rural gradient. The elevation is low, generally below 50 meters above sea level, which limits natural air dispersion. The region isn’t heavily industrialised, but agricultural practices – including seasonal burning of crop residue – represent a key source of particulate matter. The town’s location within a valley can also trap pollutants, particularly during periods of calm weather. Understanding this interplay of riverine influence, agricultural land use, and valley topography is crucial for assessing and mitigating air quality challenges in Ban Khlong.

Ban Khlong experiences a distinct tropical monsoon climate, leading to pronounced wet and dry seasons that heavily influence air quality. The dry season, typically from November to April, sees the lowest rainfall and highest temperatures. This period is often associated with increased particulate matter pollution due to agricultural burning practices preparing fields for the next planting cycle, and dust from unpaved roads. January to March are generally the months with the poorest air quality. The onset of the wet season in May brings relief, as rainfall effectively washes pollutants from the atmosphere. However, increased humidity can also contribute to the formation of mould and other biological pollutants. The peak of the wet season, from August to October, usually offers the cleanest air. Monsoon winds play a vital role in dispersing pollutants, but can also transport them from neighbouring regions. Temperature inversions, though less frequent than in temperate climates, can occur during calmer periods, trapping pollutants near the ground. Sensitive groups – children, the elderly, and those with respiratory conditions – should exercise caution during the dry season and consider limiting strenuous outdoor activity. Monitoring weather patterns and local agricultural practices is key to anticipating pollution episodes.