Thailand adjusts Air Quality Index (AQI) criteria to enhance public awareness and health protection against PM2.5

     Thailand has been grappling with the issue of particulate matter for several years, which has had significant impacts on the health of its citizens and the country's image.

     Amid a projected escalation of the particulate matter situation in the country in 2023, the Pollution Control Department has drafted a proclamation on the Air Quality Index (AQI) of Thailand. This is to adjust the interpretations and warning messages, as well as the public health care recommendations, following the revised AQI values based on the PM2.5 standard. The AQI will be adjusted from 50 micrograms per cubic meter to 37.5 micrograms per cubic meter, effective from June 1, 2023, using the World Health Organization (WHO) guidelines and interim targets as the levels for issuing AQI warnings.

     The AQI values, which are divided into the existing five-color levels - blue, green, yellow, orange, and red - will adjust the red level from previously 91 micrograms per cubic meter to 75.1 micrograms per cubic meter.

     Relevant departments must prepare to address the PM2.5 particulate matter issue according to the prescribed standard, and swiftly raise public awareness about the new standard and various measures for tackling the problem based on scientific principles. This will ensure accurate information is disseminated and collective action is taken to tackle air pollution.

     Furthermore, the Pollution Control Department has consulted with neighboring countries to elevate cooperative efforts in addressing the transboundary haze problem to an agreed standard, for serious and sustainable resolution of air quality issues.


Data updated on
Source: The Ministry of Natural Resources and Environment 
92 Soi Phaholyothin 7, Phaya Thai Road, Phaya Thai District, Bangkok 10400
Tel. +66 2278 8500


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