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Klaeng, a district of Rayong province in eastern Thailand, occupies a geographically significant position along the Gulf of Thailand coastline. Situated at coordinates 12.7797°N, 101.6483°E, the terrain is predominantly flat, typical of the Central Plains, with a gentle slope towards the sea. The elevation is low, contributing to limited natural dispersion of pollutants. Klaeng’s urban character is that of a developing coastal town, transitioning from a primarily agricultural and fishing economy to one increasingly influenced by industry. Rayong province as a whole is a major industrial hub, particularly for petrochemicals, automotive parts, and steel, and Klaeng benefits from, and is impacted by, this proximity. Surrounding Klaeng are extensive rubber plantations and fruit orchards, alongside areas of mangrove forest along the coastline. The urban-rural gradient is relatively sharp, with agricultural land quickly giving way to more concentrated development near the town centre and industrial estates further inland. This combination of coastal location, flat topography, and industrial activity creates a unique set of challenges for maintaining good air quality, as pollutants can easily accumulate and be trapped, particularly during periods of calm weather. The gulf provides some, but limited, atmospheric flushing.

Klaeng experiences a tropical monsoon climate, dictating a distinct wet and dry season rather than traditional four seasons. Air quality generally worsens during the dry season (November to April) due to reduced rainfall, which limits the natural washing of pollutants from the atmosphere. This period sees increased dust from agricultural activities and construction, alongside higher concentrations of industrial emissions. February and March are typically the months with the poorest air quality. Temperature inversions, common during the cooler, drier months, trap pollutants near the ground, exacerbating the problem. The wet season (May to October) brings significant improvements in air quality as monsoon rains cleanse the air. However, localised flooding can sometimes contribute to mould and dampness, impacting indoor air quality. August and September, peak monsoon months, offer the most favourable conditions for outdoor activity. Sensitive groups – children, the elderly, and those with respiratory conditions – should be particularly cautious during the dry season, limiting strenuous outdoor activity and considering the use of air purifiers indoors. Monitoring wind direction is crucial, as winds from industrial areas can carry higher pollutant loads.