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 Road22-03-2023 20:00-2525Very good quality
Dindaung district (PCD Station)National Housing Huaykwang Din Daeng23-03-2023 04:00-2323Very good quality
Dindaung district (PCD Station)National Housing Authority Dindaeng Din Daeng Rd.23-03-2023 04:00553239Good quality
Prakanong districtWithin Prakanong District Office22-03-2023 20:00-2020Very good quality
ฑatburana districtWithin Ratburana District Office22-03-2023 20:00-2728Good quality
Rachathewi districtWithin Ratchathewi District Office22-03-2023 20:00-3035Good quality
Dusit districtThe garden area opposite the Dusit District Office23-03-2023 05:00-2525Very good quality
Pom Prap Sattru Phai DistrictIn front of the Office of the National Economic and Social Development Board (Lan Luang intersection)23-03-2023 05:00-2323Very good quality
Samphanthawong DistrictAround the corner Chalermprakiat Arch (Odean Circle)23-03-2023 05:00-2728Good quality
Phaya Thai DistrictFront of the Army Flats near Vichaiyut Hospital Opposite the Ministry of Finance23-03-2023 05:00-2626Good quality
Khet Phaya Thai district (PCD Station)The Government Public Relations Department Phaya Thai23-03-2023 04:00322020Very good quality
Wang Thonglang DistrictIn front of Esso gas station Soi Ladprao 9523-03-2023 05:00-3239Good quality
Wang Thonglang District (PCD Station)Bodindecha Sing Singhaseni School Pubpla, 23-03-2023 04:00-2020Very good quality
Pathumwan DistrictIn front of Sam Yan Mitrtown mall23-03-2023 05:00-3035Good quality
Pathumwan District (PCD Station)Chulalongkorn Hospital Rama IV Rd.23-03-2023 04:00-2728Good quality
Bangsak DistinctBeside the police yard in front of Bang Rak Lovely Plaza23-03-2023 05:00-2830Good quality
Sathon DistrictThe intersection in front of the Sathorn District Office, Soi St. Louis Road23-03-2023 05:00-2830Good quality
Yannawa DistrictNear Bank of Ayudhya, Head Office23-03-2023 05:00-2626Good quality
Yannawa District (PCD Station)Nonsi Witthaya School Chong Nonsi23-03-2023 04:00-2933Good quality
Wattana DistrictOpposite the noble Reveal (beside MK gold restaurants)23-03-2023 05:00-2525Very good quality
Suan Luang DistrictIn front of Suan Luang District Office23-03-2023 05:00-2323Very good quality
Bang Na DistrictIn front of the mall Big C Bangna Department Store23-03-2023 05:00-3239Good quality
Bang Na District (PCD Station)Thai Meteorological Department Bang Na23-03-2023 04:00372525Very good quality
Chatuchak DistrictIn front of Kasetsart University23-03-2023 06:00-3137Good quality
Don Mueng DistrictBeside Don Mueang District Office23-03-2023 05:00-2933Good quality
Sai Mai DistrictBus stop in front of Saimai District Office22-03-2023 20:00-3137Good quality
Bangkapi DistrictBeside the police fort opposite the Bang Kapi District Office23-03-2023 04:00-2323Very good quality
Khan Na Yao DistrictAt the entrance to Suan Siam Road intersects with Ram Inthra Road.23-03-2023 05:00-2626Good quality
Lat Krabang DistrictIn front of Lat Krabang Hospital beside the police fort23-03-2023 05:00-2525Very good quality
Meenburi DistrictChalermprakiat Rama IX Park opposite the clock tower Opposite Min Buri District Office23-03-2023 05:00-2728Good quality
Nong Chok DistrictIn front of Nong Chok District Office23-03-2023 05:00-3443Good quality
Prawet DistrictIn front of Seacon Square Department Store22-03-2023 20:00-3750Good quality
Thonburi District23-03-2023 05:00-2121Very good quality
Thonburi District (PCD Station)Bansomdejchaopraya Rajabhat University Hiran Ruchi23-03-2023 04:00452626Good quality
Thonburi District (PCD Station)Thonburi Power Sub-Station Intarapitak Rd.23-03-2023 04:00-2525Very good quality
Khlong San DistrictIn front of the library under the bridge of King Taksin Bridge23-03-2023 05:00-2830Good quality
Bangkok Yai DistrictAt Tha Phra Intersection Wat Tha Phra Sub-district23-03-2023 05:00-3341Good quality
Bangkok Noi DistrictIn front of Bangkok Noi Railway Police Station23-03-2023 05:00-2933Good quality
Taling Chan DistrictPhutthamonthon Sai 1 Road, intersecting with Borommaratchachonnani Road23-03-2023 05:00-2933Good quality
Thawi Watthana DistrictEntrance to Sanam Luang 223-03-2023 03:00-2525Very good quality
Phasi Charoen DistrictIn front of Siam University (about Soi Phetkasem 36), the entrance to the university is about 10 meters.23-03-2023 05:00-2626Good quality
Nong Khaem DistrictThree intersections, next to the police fort, Maarearoen Phetkasem Road 8122-03-2023 20:00-2626Good quality
Bang Bon DistrictNear Bang Bon Market23-03-2023 05:00-2525Very good quality
Thung Khru DistrictIn front of King Mongkut s University of Technology Thonburi23-03-2023 05:00-2626Good quality
Phra Nakhon DistrictWithin the Phra Nakhon District Office22-03-2023 20:00-2830Good quality
Huai Khwang DistrictWithin the Huai Khwang District Office (Beside the nursery) Pracha Uthit Road23-03-2023 05:00-2323Very good quality
Khlong Toei DistrictWithin the Khlong Toei District Office22-03-2023 20:00-n/an/an/a
Bang Sue DistrictWithin Bang Sue District Office23-03-2023 05:00-3648Good quality
Ladphrao DistrictInside the Lat Phrao District Office23-03-2023 05:00-2525Very good quality
Laksi DistrictWithin the Laksi District Office23-03-2023 05:00-3341Good quality
Bang Khen DistrictWithin Bang Khen District Office23-03-2023 05:00-3341Good quality
Saphan Sung DistrictWithin the Saphan Sung district office23-03-2023 05:00-2222Very good quality
Buengkum DistrictWithin Bueng Kum District Office23-03-2023 01:00-3035Good quality
Klong Samwa DistrictWithin the Khlong Sam Wa District Office23-03-2023 05:00-3239Good quality
Chom Thong DistrictWithin Chomthong District Office23-03-2023 05:00-2121Very good quality
Bang Phlat DistrictWithin Bang Phlat District Office23-03-2023 05:00-n/an/an/a
Bang Khae DistrictWithin Bang Khae District Office23-03-2023 05:00-2020Very good quality
Bang Khun Thian DistrictWithin Bang Khun Thian District Office23-03-2023 05:00-2626Good quality
Bang Khun Thian District (PCD Station)Highway NO.3902 km.13 +600 Kanchanaphisek Rd23-03-2023 04:00-52104Began to affect health
Pathumwan Districtlumpini park23-03-2023 04:00-1818Very good quality
Chatuchak DistrictWacchirabenchatat Park23-03-2023 04:00-2525Very good quality
Chatuchak DistrictChatuchak Park23-03-2023 03:00-2323Very good quality
Prawet DistrictSuan Luang Rama IX23-03-2023 04:00-2020Very good quality
Lat Krabang District60th Anniversary of Queen Sirikit Park23-03-2023 04:00-2728Good quality
Khlong Toei DistrictBenchasiri Park23-03-2023 04:00-2424Very good quality
Don Mueng DistrictRommani Thungsikan Park22-03-2023 04:00-3035Good quality
Thung Khru DistrictThonburirom Park23-03-2023 04:00-1818Very good quality
Khlong Toei DistrictBenjakitti Park23-03-2023 04:00-2323Very good quality
Chatuchak DistrictQueen Sirikit Park23-03-2023 04:00-2424Very good quality
Bangkok Noi District80th Anniversary Commemoration Park23-03-2023 04:00-1818Very good quality
Buengkum DistrictSerithai Park23-03-2023 03:00-2830Good quality
Bangkae DistrictBang Khae Phirom Park23-03-2023 04:00-1818Very good quality
Thawi Watthana DistrictThawee Wanarom Park23-03-2023 04:00-2830Good quality
Lat Krabang DistrictPhra Nakhon Park23-03-2023 04:00-2020Very good quality
Nong Chok DistrictNong Chok Park23-03-2023 04:00-2626Good quality
Bang Khen DistrictRamintra Sports Park23-03-2023 04:00-2525Very good quality
Bang Kho Laem DistrictPublic Park to commemorate the sixth anniversary of His Majesty the King23-03-2023 04:00-1919Very good quality
Rachathewi districtSantiphap Park23-03-2023 04:00-2222Very good quality
Bang Phlat DistrictRama VIII Park23-03-2023 04:00-2222Very good quality
Around the Bangkok Christian HospitalVehicle air quality monitoring registration number 742723-03-2023 05:00-2020Very good quality
Opposite Soi Phahonyothin 7Vehicle air quality monitoring registration number 742823-03-2023 05:00-2222Very good quality
Bangkok Art and Culture Center areaVehicle air quality monitoring registration number 743023-03-2023 05:00-2933Good quality
In the area of ​​Samsen Nai Post OfficeVehicle air quality monitoring registration number 743123-03-2023 05:00-2525Very good quality
Pathumwan District23-03-2023 04:00-2525Very good quality
23-03-2023 04:00-2121Very 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