This 2022 World Air Quality Report is the fifth edition of IQAir's report, which was made for the purpose of presenting PM2.5 air quality data from 7,323 cities in 131 countries and regions. The data was collected from more than 30,000 terrestrial air quality monitoring stations around the world. In addition, the World Health Organization (WHO) Air Quality Guidelines were utilized as the basis for presenting air quality data. In Thailand, the air quality became cleaner in 2022 with the reduction of the average PM2.5 concentration per year to 18.1 micrograms per cubic meter, which was a 10.4% decrease from 2021.
Source: Greenpeace International
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