While other areas such as Bangkok, pathum Thani, Chiang Mai, Khon Kaen, found gasoline compounds exceeds the standard, but the majority of the dose was decreased from a year ago, which benefited from improved fuel standards year in space, 2557, Bangkok. The problem of dust, benzene, a lower dose. One part is the result of improved fuel standards EURO 3, EURO 4, ranging from a year 2555 and improving public transport and cycling. Stricter car detection with black smoke
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