Kampong Trach Air Quality Index (AQI)

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Kampong Trach, nestled within Kampot Province in Cambodia, occupies a geographically significant position in the country’s southeast. Situated at coordinates 10.5585, 104.4675, the city’s terrain is characterised by a gentle transition from the Cardamom Mountains to the coastal plains. This location, approximately 7km from the Vietnamese border, influences both its climate and air quality. The city itself is relatively low-lying, with an elevation generally under 20 meters, contributing to potential temperature inversions. Kampong Trach is closely linked to the Kampot River, which provides vital transportation and irrigation, but also acts as a potential pathway for pollutant dispersal. Surrounding the urban centre is a predominantly agricultural landscape, dominated by pepper plantations – Kampot pepper being world-renowned – and rice paddies. While not heavily industrialised, the region experiences some activity related to agricultural processing and small-scale manufacturing. The urban-rural gradient is quite pronounced; moving away from the city centre quickly reveals a rural character. This proximity to agricultural land means seasonal burning for land preparation significantly impacts local air quality. The prevailing winds, influenced by the monsoon patterns, play a crucial role in dispersing or concentrating pollutants within the valley.

Kampong Trach experiences a distinct tropical monsoon climate, shaping its air quality patterns throughout the year. The dry season, from November to April, typically sees the poorest air quality. Reduced rainfall means dust and particulate matter from agricultural activities and unpaved roads remain suspended for longer. January and February are often the clearest months, but localised burning for land preparation can cause spikes in pollution. The onset of the southwest monsoon in May brings much-needed relief, washing away pollutants and improving air quality considerably. June to October represents the wet season, with consistently cleaner air due to frequent rainfall. However, increased humidity can also foster mould growth, impacting respiratory health. November marks a transition period, with decreasing rainfall and a gradual build-up of pollutants. Temperature inversions, common during the cooler dry season nights, trap pollutants near the ground, exacerbating air quality issues. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the dry season, particularly in January and February. Monitoring wind direction is also advisable, as pollutants can be carried from surrounding agricultural areas.