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

Dindaung districtAlong Vibhavadi Rangsit Road01-10-2020 21:00481524Very good quality
Prakanong districtWithin Prakanong District Office01-10-2020 21:00251414Very good quality
ฑatburana districtWithin Ratburana District Office01-10-2020 22:00541228Good quality
Rachathewi districtWithin Ratchathewi District Office01-10-2020 21:00372222Very good quality
Dusit districtThe garden area opposite the Dusit District Office01-10-2020 22:00231112Very good quality
Pom Prap Sattru Phai DistrictIn front of the Office of the National Economic and Social Development Board (Lan Luang intersection)01-10-2020 22:00341017Very good quality
Samphanthawong DistrictAround the corner Chalermprakiat Arch (Odean Circle)01-10-2020 22:00-1515Very good quality
Phaya Thai DistrictFront of the Army Flats near Vichaiyut Hospital Opposite the Ministry of Finance01-10-2020 22:00-1313Very good quality
Wang Thonglang DistrictIn front of Esso gas station Soi Ladprao 9522-09-2020 10:00-n/an/an/a
Pathumwan DistrictIn front of Sam Yan Mitrtown mall01-10-2020 22:00-1212Very good quality
Bangsak DistinctBeside the police yard in front of Bang Rak Lovely Plaza01-10-2020 22:00-1313Very good quality
Sathon DistrictThe intersection in front of the Sathorn District Office, Soi St. Louis Road01-10-2020 22:00-1919Very good quality
Bang Kho Laem DistrictPolice area, the road intersection01-10-2020 22:00-2222Very good quality
Yannawa DistrictNear Bank of Ayudhya, Head Office01-10-2020 17:00-1313Very good quality
Wattana DistrictOpposite the noble Reveal (beside MK gold restaurants)01-10-2020 22:00351318Very good quality
Suan Luang DistrictIn front of Suan Luang District Office01-10-2020 22:0023812Very good quality
Bang Na DistrictIn front of the mall Big C Bangna Department Store01-10-2020 22:00531628Good quality
Chatuchak DistrictIn front of Kasetsart University01-10-2020 22:00-88Very good quality
Don Mueng DistrictBeside Don Mueang District Office01-10-2020 22:001869Very good quality
Sai Mai DistrictBus stop in front of Saimai District Office01-10-2020 22:00361518Very good quality
Bangkapi DistrictBeside the police fort opposite the Bang Kapi District Office01-10-2020 22:00-1818Very good quality
Khan Na Yao DistrictAt the entrance to Suan Siam Road intersects with Ram Inthra Road.01-10-2020 22:0025713Very good quality
Lat Krabang DistrictIn front of Lat Krabang Hospital beside the police fort01-10-2020 22:00-1616Very good quality
Meenburi DistrictChalermprakiat Rama IX Park opposite the clock tower Opposite Min Buri District Office01-10-2020 22:00591633Good quality
Nong Chok DistrictIn front of Nong Chok District Office01-10-2020 22:00812351Medium
Prawet DistrictIn front of Seacon Square Department Store01-10-2020 22:00541928Good quality
Thon Buri DistrictAlong the bus stop in the area01-10-2020 22:00-1515Very good quality
Khlong San DistrictIn front of the library under the bridge of King Taksin Bridge01-10-2020 22:00-1818Very good quality
Bangkok Yai DistrictAt Tha Phra Intersection Wat Tha Phra Sub-district01-10-2020 22:00432222Very good quality
Bangkok Noi DistrictIn front of Bangkok Noi Railway Police Station01-10-2020 22:00-1313Very good quality
Taling Chan DistrictPhutthamonthon Sai 1 Road, intersecting with Borommaratchachonnani Road01-10-2020 22:00411321Very good quality
Thawi Watthana DistrictEntrance to Sanam Luang 201-10-2020 22:001599Very good quality
Phasi Charoen DistrictIn front of Siam University (about Soi Phetkasem 36), the entrance to the university is about 10 meters.01-10-2020 11:00-1515Very good quality
Nong Khaem DistrictThree intersections, next to the police fort, Maarearoen Phetkasem Road 801-10-2020 22:00421921Very good quality
Bang Bon DistrictNear Bang Bon Market01-10-2020 22:00411921Very good quality
Thung Khru DistrictIn front of King Mongkut s University of Technology Thonburi01-10-2020 22:00361418Very good quality
Phra Nakhon DistrictWithin the Phra Nakhon District Office01-10-2020 22:00-n/an/an/a
Huai Khwang DistrictWithin the Huai Khwang District Office (Beside the nursery) Pracha Uthit Road01-10-2020 22:0023712Very good quality
Khlong Toei DistrictWithin the Khlong Toei District Office01-10-2020 22:00-1717Very good quality
Bang Sue DistrictWithin Bang Sue District Office01-10-2020 22:00-77Very good quality
Ladphrao DistrictInside the Lat Phrao District Office01-10-2020 22:0022811Very good quality
Laksi DistrictWithin the Laksi District Office01-10-2020 22:00-1010Very good quality
Bang Khen DistrictWithin Bang Khen District Office01-10-2020 22:00-1414Very good quality
Saphan Sung DistrictWithin the Saphan Sung district office01-10-2020 22:0027714Very good quality
Buengkum DistrictWithin Bueng Kum District Office01-10-2020 22:00-1313Very good quality
Klong Samwa DistrictWithin the Khlong Sam Wa District Office01-10-2020 22:0037919Very good quality
Chom Thong DistrictWithin Chomthong District Office01-10-2020 22:001699Very good quality
Bang Phlat DistrictWithin Bang Phlat District Office01-10-2020 22:00-66Very good quality
Bang Khae DistrictWithin Bang Khae District Office01-10-2020 22:00251213Very good quality
Bang Khun Thian DistrictWithin Bang Khun Thian District Office01-10-2020 22:00-1414Very good quality
Pathumwan District01-10-2020 22:00-1515Very good quality
01-10-2020 22:00-99Very good 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