One thing that often gets overlooked in these discussions is that Bangkok's air quality problem is largely seasonal, not year-round. The main issue is the burning season, typically from Late December, January, with February and March often being poor - During this period, agricultural burning across Northern Thailand, Laos, Myanmar and Cambodia, combined with forest fires, releases large amounts of PM2.5 into the atmosphere. That smoke can travel hundreds of kilometres and affect Bangkok even though the fires are nowhere near the city. At the same time, the cool, dry season creates stable atmospheric conditions and temperature inversions that trap pollution close to the ground. Add Bangkok's traffic, diesel vehicles, construction dust and general urban emissions, and air quality can deteriorate quite quickly. However, from around May through November, conditions are often completely different. Regular rainfall helps wash particulates out of the air, stronger atmospheric mixing disperses pollution, and AQI levels are mostly in the Good range. During these months, Bangkok can have air quality comparable to many European cities. That's why the statement that "Bangkok is polluted all year round" isn't accurate. There are periods when the air is genuinely awful, and anyone living here will acknowledge that. But there are also long stretches of the year when air quality is perfectly reasonable. The city's reputation is largely driven by the severity of the burning season, not by conditions throughout the entire year.
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