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 Road29-02-2020 14:00772448Good quality
Prakanong districtWithin Prakanong District Office29-02-2020 14:00n/a2830Good quality
ฑatburana districtWithin Ratburana District Office29-02-2020 14:00552329Good quality
Rachathewi districtWithin Ratchathewi District Office29-02-2020 14:00462933Good quality
Dusit districtThe garden area opposite the Dusit District Office29-02-2020 14:0057n/a31Good quality
Pom Prap Sattru Phai DistrictIn front of the Office of the National Economic and Social Development Board (Lan Luang intersection)29-02-2020 14:00592633Good quality
Samphanthawong DistrictAround the corner Chalermprakiat Arch (Odean Circle)29-02-2020 14:00-3035Good quality
Phaya Thai DistrictFront of the Army Flats near Vichaiyut Hospital Opposite the Ministry of Finance29-02-2020 14:00-3239Good quality
Wang Thonglang DistrictIn front of Esso gas station Soi Ladprao 9529-02-2020 14:00-4476Medium
Pathumwan DistrictIn front of Sam Yan Mitrtown mall29-02-2020 00:00-n/an/an/a
Bangsak DistinctBeside the police yard in front of Bang Rak Lovely Plaza29-02-2020 14:00-3648Good quality
Sathon DistrictThe intersection in front of the Sathorn District Office, Soi St. Louis Road29-02-2020 13:00-2933Good quality
Bang Kho Laem DistrictPolice area, the road intersection29-02-2020 14:00-3443Good quality
Yannawa DistrictNear Bank of Ayudhya, Head Office29-02-2020 14:00-3546Good quality
Wattana DistrictOpposite the noble Reveal (beside MK gold restaurants)29-02-2020 14:0096-70Medium
Suan Luang DistrictIn front of Suan Luang District Office29-02-2020 14:00n/a2933Good quality
Bang Na DistrictIn front of the mall Big C Bangna Department Store29-02-2020 14:0070-42Good quality
Chatuchak DistrictIn front of Kasetsart University29-02-2020 14:00-3137Good quality
Don Mueng DistrictBeside Don Mueang District Office29-02-2020 14:00583648Good quality
Sai Mai DistrictBus stop in front of Saimai District Office29-02-2020 14:00803450Good quality
Bangkapi DistrictBeside the police fort opposite the Bang Kapi District Office29-02-2020 14:00-3851Medium
Khan Na Yao DistrictAt the entrance to Suan Siam Road intersects with Ram Inthra Road.29-02-2020 14:0063-36Good quality
Lat Krabang DistrictIn front of Lat Krabang Hospital beside the police fort29-02-2020 14:00-3546Good quality
Meenburi DistrictChalermprakiat Rama IX Park opposite the clock tower Opposite Min Buri District Office29-02-2020 14:0061-34Good quality
Nong Chok DistrictIn front of Nong Chok District Office29-02-2020 14:00n/a-n/an/a
Prawet DistrictIn front of Seacon Square Department Store29-02-2020 14:0080-50Good quality
Thon Buri DistrictAlong the bus stop in the area29-02-2020 14:00-2222Very good quality
Khlong San DistrictIn front of the library under the bridge of King Taksin Bridge29-02-2020 14:00-3546Good quality
Bangkok Yai DistrictAt Tha Phra Intersection Wat Tha Phra Sub-district29-02-2020 14:00613341Good quality
Bangkok Noi DistrictIn front of Bangkok Noi Railway Police Station29-02-2020 14:00-3443Good quality
Taling Chan DistrictPhutthamonthon Sai 1 Road, intersecting with Borommaratchachonnani Road29-02-2020 14:00643137Good quality
Thawi Watthana DistrictEntrance to Sanam Luang 229-02-2020 14:00523035Good quality
Phasi Charoen DistrictIn front of Siam University (about Soi Phetkasem 36), the entrance to the university is about 10 meters.29-02-2020 14:00-2933Good quality
Nong Khaem DistrictThree intersections, next to the police fort, Maarearoen Phetkasem Road 829-02-2020 14:00412424Very good quality
Bang Bon DistrictNear Bang Bon Market29-02-2020 14:00522933Good quality
Thung Khru DistrictIn front of King Mongkut s University of Technology Thonburi29-02-2020 14:00532628Good quality
Phra Nakhon DistrictWithin the Phra Nakhon District Office29-02-2020 14:00-2933Good quality
Huai Khwang DistrictWithin the Huai Khwang District Office (Beside the nursery) Pracha Uthit Road29-02-2020 14:00582632Good quality
Khlong Toei DistrictWithin the Khlong Toei District Office29-02-2020 14:00-3851Medium
Bang Sue DistrictWithin Bang Sue District Office29-02-2020 14:00-3341Good quality
Ladphrao DistrictInside the Lat Phrao District Office29-02-2020 14:00562630Good quality
Laksi DistrictWithin the Laksi District Office29-02-2020 14:00-4163Medium
Bang Khen DistrictWithin Bang Khen District Office29-02-2020 14:00-3443Good quality
Saphan Sung DistrictWithin the Saphan Sung district office29-02-2020 14:00582632Good quality
Buengkum DistrictWithin Bueng Kum District Office28-02-2020 20:00-n/an/an/a
Klong Samwa DistrictWithin the Khlong Sam Wa District Office29-02-2020 14:00622935Good quality
Chom Thong DistrictWithin Chomthong District Office29-02-2020 14:00282323Very good quality
Bang Phlat DistrictWithin Bang Phlat District Office29-02-2020 14:00-n/an/an/a
Bang Khae DistrictWithin Bang Khae District Office29-02-2020 14:00352222Very good quality
Bang Khun Thian DistrictWithin Bang Khun Thian District Office29-02-2020 14:00-2933Good quality
Around the Bangkok Christian HospitalVehicle air quality monitoring registration number 742729-02-2020 14:00301919Very good quality
Opposite Soi Phahonyothin 7Vehicle air quality monitoring registration number 743029-02-2020 14:00503035Good quality
Bangkok Art and Culture Center areaVehicle air quality monitoring registration number 742829-02-2020 14:00723143Good quality
Pathumwan DistrictCentral World29-02-2020 14:00-2525Very 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