Quality Index

Air Quality Index Is a report of air quality data
in a format that is easy to understand by the general public.
To publicize to the public about air pollution situations
In each area that is at what level Does it affect health?
Which the air quality index is a universal format
that is widely used in many countries such as
United States, Australia, Singapore, Malaysia and
Thailand etc.

Air quality index used in Thailand Calculated by comparing
the air quality standards in the general atmosphere
of 6 types of air pollutants, namely Ozone (O3) averaged 8 hours,
Nitrogen dioxide (NO2) an average of 1 hours average
Carbon monoxide (CO) 8 hours,
Sulfur dioxide (SO2) an average of 1 hour,
Dust size not exceeding 10 microns (PM10) average 24 hours,
Dust size not exceeding 2.5 microns (PM2.5) 24 hours average,
The previous calculated air quality index of any type
of air pollutant has the highest value.
Will be used as the air quality index of that day

Thailand's air quality index is divided into 5 levels.
is from 0 to 201 or more, each level uses color as
the symbol for the level of health impact.
hygiene (Table 1) by Air Quality Index 100
will have the same value as the air quality standards.
in general, if the air quality index is higher than 100,
shows that the concentration of air pollution is worth more than
standard and air quality on the day That will start in effect.
affecting people's health

Air quality index
criteria for Thailand

Very good quality
AQI 0-25
Very good air quality Suitable for outdoor activities and tourism
Good quality
AQI 26-50
Good air quality Can do outdoor activities and travel as usual
AQI 51-100
General people : can do outdoor activities as usual
People who need special health care : If there are basic symptoms such as coughing,difficulty breathing,eye irritation,should reduce the duration of outdoor activities.
Began to affect health
AQI 101-200
General people : should monitor health If there are basic symptoms such as coughing, difficulty breathing, eye irritation, should reduce the duration of outdoor activities. Or use self-protection equipment if necessary.
People who need special health care : should reduce the duration of outdoor activities Or use self-protection equipment if necessary If there are health symptoms such as coughing, dyspnea, eye inflammation, chest tightness, headache, irregular heart beat, nausea, fatigue, consult a doctor.
Affecting health
AQI AQI > 201
Everyone should avoid all kinds of outdoor activities. Avoid areas with high air pollution Or use self-protection equipment if necessary If there is a health condition, consult a doctor.

Daily air quality index calculation of each type of air pollutants {i}

Will be calculated from the concentration of air pollution from the air quality measurement
data With each level of air pollutant concentration equivalent to the air quality index at various levels
(Table 2) and the following formula

  • Xi = the concentration of air pollutants from the measurement results
  • Xij = the concentration of air pollutants that is the lowest of the range with the value Xi.
  • Xij + 1 = the concentration of air pollutants that is the highest value
    of the range with the value Xi.
  • Ii = air quality sub-index value
  • Iij = the air quality index sub value that is the lowest of the range with the Ii value.
  • Iij + 1 = the air quality sub-index value that is the highest value
    of the range with that Ii value.
  • AQI = air quality index


Station location

Latest data

PM10 (µg/m3)
(24 ชม.)

PM2.5 (µg/m3)
(24 ชม.)


The standard

Dusit districtThe garden area opposite the Dusit District Office17-11-2019 05:0062-35Good quality
Pom Prap Sattru Phai DistrictIn front of the Office of the National Economic and Social Development Board (Lan Luang intersection)17-11-2019 05:0078-48Good quality
Samphanthawong DistrictAround the corner Chalermprakiat Arch (Odean Circle)17-11-2019 05:00-3546Good quality
Phaya Thai DistrictFront of the Army Flats near Vichaiyut Hospital Opposite the Ministry of Finance17-11-2019 03:00-3035Good quality
Wang Thonglang DistrictIn front of Esso gas station Soi Ladprao 9517-11-2019 05:00-4163Medium
Pathumwan DistrictIn front of Sam Yan Mitrtown mall17-11-2019 05:00-4476Medium
Bangsak DistinctBeside the police yard in front of Bang Rak Lovely Plaza17-11-2019 05:00-3239Good quality
Sathon DistrictThe intersection in front of the Sathorn District Office, Soi St. Louis Road16-11-2019 14:00-53106Began to affect health
Bang Kho Laem DistrictPolice area, the road intersection17-11-2019 05:00-55111Began to affect health
Yannawa DistrictNear Bank of Ayudhya, Head Office17-11-2019 05:00-3750Good quality
Wattana DistrictOpposite the noble Reveal (beside MK gold restaurants)17-11-2019 05:0094-67Medium
Suan Luang DistrictIn front of Suan Luang District Office17-11-2019 05:0068-40Good quality
Bang Na DistrictIn front of the mall Big C Bangna Department Store17-11-2019 05:0068-40Good quality
Chatuchak DistrictIn front of Kasetsart University17-11-2019 05:00-2933Good quality
Don Mueng DistrictBeside Don Mueang District Office17-11-2019 05:0055-29Good quality
Sai Mai DistrictBus stop in front of Saimai District Office17-11-2019 05:0073-44Good quality
Bangkapi DistrictBeside the police fort opposite the Bang Kapi District Office16-11-2019 17:00-3443Good quality
Khan Na Yao DistrictAt the entrance to Suan Siam Road intersects with Ram Inthra Road.17-11-2019 05:0062-35Good quality
Lat Krabang DistrictIn front of Lat Krabang Hospital beside the police fort17-11-2019 05:00-3443Good quality
Meenburi DistrictChalermprakiat Rama IX Park opposite the clock tower Opposite Min Buri District Office17-11-2019 05:0077-48Good quality
Nong Chok DistrictIn front of Nong Chok District Office16-11-2019 23:0070-42Good quality
Prawet DistrictIn front of Seacon Square Department Store17-11-2019 05:0095-69Medium
Thon Buri DistrictAlong the bus stop in the area17-11-2019 05:00-3750Good quality
Khlong San DistrictIn front of the library under the bridge of King Taksin Bridge17-11-2019 05:00-4163Medium
Bangkok Yai DistrictAt Tha Phra Intersection Wat Tha Phra Sub-district17-11-2019 05:0076-47Good quality
Bangkok Noi DistrictIn front of Bangkok Noi Railway Police Station17-11-2019 05:00-4059Medium
Taling Chan DistrictPhutthamonthon Sai 1 Road, intersecting with Borommaratchachonnani Road17-11-2019 05:0091-64Medium
Thawi Watthana DistrictEntrance to Sanam Luang 217-11-2019 05:0094-67Medium
Phasi Charoen DistrictIn front of Siam University (about Soi Phetkasem 36), the entrance to the university is about 10 meters.17-11-2019 05:00-59121Began to affect health
Nong Khaem DistrictThree intersections, next to the police fort, Maarearoen Phetkasem Road 817-11-2019 05:00103-79Medium
Bang Bon DistrictNear Bang Bon Market17-11-2019 05:0091-64Medium
Thung Khru DistrictIn front of King Mongkut's University of Technology Thonburi17-11-2019 05:0069-41Good quality
Phra Nakhon DistrictWithin the Phra Nakhon District Office17-11-2019 05:00-3137Good quality
Huai Khwang DistrictWithin the Huai Khwang District Office (Beside the nursery) Pracha Uthit Road17-11-2019 05:0060-33Good quality
Khlong Toei DistrictWithin the Khlong Toei District Office17-11-2019 05:00-4163Medium
Bang Sue DistrictWithin Bang Sue District Office17-11-2019 05:00-4580Medium
Ladphrao DistrictInside the Lat Phrao District Office17-11-2019 05:0056-30Good quality
Laksi DistrictWithin the Laksi District Office17-11-2019 05:00-4580Medium
Bang Khen DistrictWithin Bang Khen District Office17-11-2019 05:00-4267Medium
Saphan Sung DistrictWithin the Saphan Sung district office17-11-2019 05:0054-28Good quality
Buengkum DistrictWithin Bueng Kum District Office17-11-2019 05:00-3851Medium
Klong Samwa DistrictWithin the Khlong Sam Wa District Office16-11-2019 23:0070-42Good quality
Chom Thong DistrictWithin Chomthong District Office17-11-2019 05:0048-24Very good quality
Bang Phlat DistrictWithin Bang Phlat District Office17-11-2019 05:00-54109Began to affect health
Bang Khae DistrictWithin Bang Khae District Office17-11-2019 05:0074-45Good quality
Bang Khun Thian DistrictWithin Bang Khun Thian District Office17-11-2019 05:00-51101Began to affect health
Around the Bangkok Christian HospitalVehicle air quality monitoring registration number 742717-11-2019 05:00522830Good quality
Opposite Soi Phahonyothin 7Vehicle air quality monitoring registration number 743017-11-2019 05:00603035Good quality
Bangkok Art and Culture Center areaVehicle air quality monitoring registration number 742817-11-2019 05:00703546Good quality
In the area of ​​Samsen Nai Post OfficeVehicle air quality monitoring registration number 743117-11-2019 05:00502025Very good quality
Pathumwan DistrictCentral World17-11-2019 05:00-2830Good quality

PM10 Unit: micrograms per cubic meter (µg/m3)

PM2.5 Unit: micrograms per cubic meter (µg/m3)

- : No measuring equipment

n/a : No measurement data

The information shown is information that has passed the preliminary examination only
If there are questions and suggestions Please contact the Air Quality and Noise Management Division
Environment Bureau Bangkok
Copyright 2018 Bangkok Air Quality