In Thailand, the enactment of the Enhancement and Conservation
of National Environmental Quality Act in 1992 was the
beginning of the new era in air quality management. Air pollution
has been identified by the public as a major environmental problem.
This can be seen clearly in large communities and in rapidly
developing areas in Thailand, where industry, transportation, traffic
and construction are prevalent, as well as in areas where electricity
power plant is situated [36,67,68].