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 Road28-11-2020 05:00521727Good quality
Prakanong districtWithin Prakanong District Office28-11-2020 05:00632436Good quality
ฑatburana districtWithin Ratburana District Office28-11-2020 05:00361018Very good quality
Rachathewi districtWithin Ratchathewi District Office28-11-2020 05:00401920Very good quality
Dusit districtThe garden area opposite the Dusit District Office28-11-2020 05:00341617Very good quality
Pom Prap Sattru Phai DistrictIn front of the Office of the National Economic and Social Development Board (Lan Luang intersection)28-11-2020 00:00n/a2424Very good quality
Samphanthawong DistrictAround the corner Chalermprakiat Arch (Odean Circle)28-11-2020 05:00-1818Very good quality
Phaya Thai DistrictFront of the Army Flats near Vichaiyut Hospital Opposite the Ministry of Finance28-11-2020 05:00-1919Very good quality
Wang Thonglang DistrictIn front of Esso gas station Soi Ladprao 9528-11-2020 05:00-2323Very good quality
Pathumwan DistrictIn front of Sam Yan Mitrtown mall28-11-2020 05:00-1919Very good quality
Bangsak DistinctBeside the police yard in front of Bang Rak Lovely Plaza28-11-2020 05:00-1515Very good quality
Sathon DistrictThe intersection in front of the Sathorn District Office, Soi St. Louis Road28-11-2020 05:00-1616Very good quality
Yannawa DistrictNear Bank of Ayudhya, Head Office28-11-2020 05:00-1818Very good quality
Wattana DistrictOpposite the noble Reveal (beside MK gold restaurants)28-11-2020 05:00371319Very good quality
Suan Luang DistrictIn front of Suan Luang District Office28-11-2020 05:00491725Very good quality
Bang Na DistrictIn front of the mall Big C Bangna Department Store28-11-2020 05:00482224Very good quality
Chatuchak DistrictIn front of Kasetsart University28-11-2020 06:00-1818Very good quality
Don Mueng DistrictBeside Don Mueang District Office28-11-2020 05:00451823Very good quality
Sai Mai DistrictBus stop in front of Saimai District Office28-11-2020 05:00501825Very good quality
Bangkapi DistrictBeside the police fort opposite the Bang Kapi District Office28-11-2020 05:00-1717Very good quality
Khan Na Yao DistrictAt the entrance to Suan Siam Road intersects with Ram Inthra Road.28-11-2020 05:00471724Very good quality
Lat Krabang DistrictIn front of Lat Krabang Hospital beside the police fort28-11-2020 05:00-1717Very good quality
Meenburi DistrictChalermprakiat Rama IX Park opposite the clock tower Opposite Min Buri District Office28-11-2020 05:00501725Very good quality
Nong Chok DistrictIn front of Nong Chok District Office28-11-2020 05:00391420Very good quality
Prawet DistrictIn front of Seacon Square Department Store28-11-2020 05:00512426Good quality
Thon Buri DistrictAlong the bus stop in the area28-11-2020 05:00-2020Very good quality
Khlong San DistrictIn front of the library under the bridge of King Taksin Bridge28-11-2020 05:00-2121Very good quality
Bangkok Yai DistrictAt Tha Phra Intersection Wat Tha Phra Sub-district28-11-2020 05:00422323Very good quality
Bangkok Noi DistrictIn front of Bangkok Noi Railway Police Station28-11-2020 05:00-1717Very good quality
Taling Chan DistrictPhutthamonthon Sai 1 Road, intersecting with Borommaratchachonnani Road28-11-2020 05:00542328Good quality
Thawi Watthana DistrictEntrance to Sanam Luang 228-11-2020 05:00452223Very good quality
Phasi Charoen DistrictIn front of Siam University (about Soi Phetkasem 36), the entrance to the university is about 10 meters.28-11-2020 05:00-2222Very good quality
Nong Khaem DistrictThree intersections, next to the police fort, Maarearoen Phetkasem Road 828-11-2020 04:00792849Good quality
Bang Bon DistrictNear Bang Bon Market28-11-2020 05:00492325Very good quality
Thung Khru DistrictIn front of King Mongkut s University of Technology Thonburi28-11-2020 05:00411821Very good quality
Phra Nakhon DistrictWithin the Phra Nakhon District Office28-11-2020 05:00-2121Very good quality
Huai Khwang DistrictWithin the Huai Khwang District Office (Beside the nursery) Pracha Uthit Road28-11-2020 05:00431322Very good quality
Khlong Toei DistrictWithin the Khlong Toei District Office28-11-2020 05:00-1919Very good quality
Bang Sue DistrictWithin Bang Sue District Office28-11-2020 05:00-n/an/an/a
Ladphrao DistrictInside the Lat Phrao District Office28-11-2020 05:00481324Very good quality
Laksi DistrictWithin the Laksi District Office28-11-2020 05:00-1616Very good quality
Bang Khen DistrictWithin Bang Khen District Office28-11-2020 05:00-2121Very good quality
Saphan Sung DistrictWithin the Saphan Sung district office28-11-2020 05:00401420Very good quality
Buengkum DistrictWithin Bueng Kum District Office28-11-2020 05:00-1919Very good quality
Klong Samwa DistrictWithin the Khlong Sam Wa District Office28-11-2020 05:00541928Good quality
Chom Thong DistrictWithin Chomthong District Office28-11-2020 00:00n/a1111Very good quality
Bang Phlat DistrictWithin Bang Phlat District Office28-11-2020 05:00-2222Very good quality
Bang Khae DistrictWithin Bang Khae District Office28-11-2020 05:00321919Very good quality
Bang Khun Thian DistrictWithin Bang Khun Thian District Office28-11-2020 05:00-2323Very good quality
Pathumwan Districtlumpini park28-11-2020 00:00-99Very good quality
Chatuchak DistrictWacchirabenchatat Park28-11-2020 00:00-1010Very good quality
Chatuchak DistrictChatuchak Park28-11-2020 00:00-1010Very good quality
Prawet DistrictSuan Luang Rama IX28-11-2020 00:00-1111Very good quality
Lat Krabang District60th Anniversary of Queen Sirikit Park28-11-2020 00:00-1111Very good quality
Khlong Toei DistrictBenchasiri Park28-11-2020 00:00-1111Very good quality
Buengkum DistrictNawaminpilom Park28-11-2020 00:00-1313Very good quality
Thung Khru DistrictThonburirom Park28-11-2020 00:00-1313Very good quality
Khlong Toei DistrictBenjakitti Park28-11-2020 00:00-99Very good quality
Chatuchak DistrictQueen Sirikit Park28-11-2020 00:00-99Very good quality
Bangkok Noi District80th Anniversary Commemoration Park28-11-2020 00:00-1010Very good quality
Buengkum DistrictSiri Thai park28-11-2020 00:00-1010Very good quality
Bangkae DistrictBang Khae Phirom Park28-11-2020 00:00-1414Very good quality
Thawi Watthana DistrictThawee Wanarom Park28-11-2020 00:00-1717Very good quality
Lat Krabang DistrictPhra Nakhon Park28-11-2020 00:00-99Very good quality
Nong Chok DistrictNong Chok Park28-11-2020 00:00-1111Very good quality
Bang Khen DistrictRamintra Sports Park28-11-2020 00:00-1212Very good quality
Bang Kho Laem DistrictPublic Park to commemorate the sixth anniversary of His Majesty the King28-11-2020 00:00-1010Very good quality
Rachathewi districtSantiphap Park28-11-2020 00:00-1111Very good quality
Bang Phlat DistrictRama VIII Park28-11-2020 00:00-1010Very good quality
Pathumwan District27-11-2020 21:00-1515Very good quality
28-11-2020 00:00-1010Very good quality
28-11-2020 00:00-1616Very 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