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 Road27-05-2022 00:00641837Good quality
Prakanong districtWithin Prakanong District Office27-05-2022 00:00371519Very good quality
ฑatburana districtWithin Ratburana District Office27-05-2022 00:00612134Good quality
Rachathewi districtWithin Ratchathewi District Office27-05-2022 00:00342626Good quality
Dusit districtThe garden area opposite the Dusit District Office27-05-2022 00:00441622Very good quality
Pom Prap Sattru Phai DistrictIn front of the Office of the National Economic and Social Development Board (Lan Luang intersection)27-05-2022 00:00461623Very good quality
Samphanthawong DistrictAround the corner Chalermprakiat Arch (Odean Circle)27-05-2022 00:00-1515Very good quality
Phaya Thai DistrictFront of the Army Flats near Vichaiyut Hospital Opposite the Ministry of Finance27-05-2022 00:00-1414Very good quality
Wang Thonglang DistrictIn front of Esso gas station Soi Ladprao 9527-05-2022 00:00-2626Good quality
Pathumwan DistrictIn front of Sam Yan Mitrtown mall27-05-2022 00:00-1818Very good quality
Bangsak DistinctBeside the police yard in front of Bang Rak Lovely Plaza27-05-2022 00:00-1515Very good quality
Sathon DistrictThe intersection in front of the Sathorn District Office, Soi St. Louis Road27-05-2022 00:00-2121Very good quality
Yannawa DistrictNear Bank of Ayudhya, Head Office27-05-2022 00:00-1818Very good quality
Wattana DistrictOpposite the noble Reveal (beside MK gold restaurants)27-05-2022 00:00491625Very good quality
Suan Luang DistrictIn front of Suan Luang District Office27-05-2022 00:00321316Very good quality
Bang Na DistrictIn front of the mall Big C Bangna Department Store27-05-2022 00:00532428Good quality
Chatuchak DistrictIn front of Kasetsart University27-05-2022 01:00-1414Very good quality
Don Mueng DistrictBeside Don Mueang District Office27-05-2022 00:00281114Very good quality
Sai Mai DistrictBus stop in front of Saimai District Office27-05-2022 00:00n/a1919Very good quality
Bangkapi DistrictBeside the police fort opposite the Bang Kapi District Office27-05-2022 00:00-2830Good quality
Khan Na Yao DistrictAt the entrance to Suan Siam Road intersects with Ram Inthra Road.27-05-2022 00:00331417Very good quality
Lat Krabang DistrictIn front of Lat Krabang Hospital beside the police fort27-05-2022 00:00-2424Very good quality
Meenburi DistrictChalermprakiat Rama IX Park opposite the clock tower Opposite Min Buri District Office27-05-2022 00:00622235Good quality
Nong Chok DistrictIn front of Nong Chok District Office27-05-2022 00:00621735Good quality
Prawet DistrictIn front of Seacon Square Department Store27-05-2022 00:00602333Good quality
Thon Buri DistrictAlong the bus stop in the area27-05-2022 00:00-1818Very good quality
Khlong San DistrictIn front of the library under the bridge of King Taksin Bridge27-05-2022 00:00-2121Very good quality
Bangkok Yai DistrictAt Tha Phra Intersection Wat Tha Phra Sub-district27-05-2022 00:00402323Very good quality
Bangkok Noi DistrictIn front of Bangkok Noi Railway Police Station24-05-2022 12:00-n/an/an/a
Taling Chan DistrictPhutthamonthon Sai 1 Road, intersecting with Borommaratchachonnani Road27-05-2022 00:00422021Very good quality
Thawi Watthana DistrictEntrance to Sanam Luang 227-05-2022 00:00n/a1515Very good quality
Phasi Charoen DistrictIn front of Siam University (about Soi Phetkasem 36), the entrance to the university is about 10 meters.27-05-2022 00:00-n/an/an/a
Nong Khaem DistrictThree intersections, next to the police fort, Maarearoen Phetkasem Road 8127-05-2022 00:00542830Good quality
Bang Bon DistrictNear Bang Bon Market27-05-2022 00:00522527Good quality
Thung Khru DistrictIn front of King Mongkut s University of Technology Thonburi27-05-2022 00:00361618Very good quality
Phra Nakhon DistrictWithin the Phra Nakhon District Office27-05-2022 00:00-2121Very good quality
Huai Khwang DistrictWithin the Huai Khwang District Office (Beside the nursery) Pracha Uthit Road27-05-2022 00:00331117Very good quality
Khlong Toei DistrictWithin the Khlong Toei District Office27-05-2022 00:00-1818Very good quality
Bang Sue DistrictWithin Bang Sue District Office27-05-2022 00:00-2121Very good quality
Ladphrao DistrictInside the Lat Phrao District Office26-05-2022 23:00n/a1616Very good quality
Laksi DistrictWithin the Laksi District Office27-05-2022 00:00-1313Very good quality
Bang Khen DistrictWithin Bang Khen District Office27-05-2022 00:00-n/an/an/a
Saphan Sung DistrictWithin the Saphan Sung district office27-05-2022 00:00281114Very good quality
Buengkum DistrictWithin Bueng Kum District Office27-05-2022 00:00-1616Very good quality
Klong Samwa DistrictWithin the Khlong Sam Wa District Office27-05-2022 00:00351818Very good quality
Chom Thong DistrictWithin Chomthong District Office27-05-2022 00:00311616Very good quality
Bang Phlat DistrictWithin Bang Phlat District Office27-05-2022 00:00-1111Very good quality
Bang Khae DistrictWithin Bang Khae District Office27-05-2022 00:00381819Very good quality
Bang Khun Thian DistrictWithin Bang Khun Thian District Office27-05-2022 00:00-1919Very good quality
Pathumwan Districtlumpini park27-05-2022 00:00-88Very good quality
Chatuchak DistrictWacchirabenchatat Park27-05-2022 00:00-1414Very good quality
Chatuchak DistrictChatuchak Park27-05-2022 00:00-1212Very good quality
Prawet DistrictSuan Luang Rama IX27-05-2022 00:00-1212Very good quality
Lat Krabang District60th Anniversary of Queen Sirikit Park27-05-2022 00:00-1414Very good quality
Khlong Toei DistrictBenchasiri Park27-05-2022 00:00-1313Very good quality
Don Mueng DistrictRommani Thungsikan Park27-05-2022 00:00-1111Very good quality
Thung Khru DistrictThonburirom Park27-05-2022 00:00-1616Very good quality
Khlong Toei DistrictBenjakitti Park27-05-2022 00:00-1111Very good quality
Chatuchak DistrictQueen Sirikit Park27-05-2022 00:00-1515Very good quality
Bangkok Noi District80th Anniversary Commemoration Park26-05-2022 23:00-1414Very good quality
Buengkum DistrictSerithai Park27-05-2022 00:00-1717Very good quality
Bangkae DistrictBang Khae Phirom Park27-05-2022 00:00-1515Very good quality
Thawi Watthana DistrictThawee Wanarom Park27-05-2022 00:00-1414Very good quality
Lat Krabang DistrictPhra Nakhon Park27-05-2022 00:00-1111Very good quality
Nong Chok DistrictNong Chok Park27-05-2022 00:00-1313Very good quality
Bang Khen DistrictRamintra Sports Park27-05-2022 00:00-1111Very good quality
Bang Kho Laem DistrictPublic Park to commemorate the sixth anniversary of His Majesty the King27-05-2022 00:00-1111Very good quality
Rachathewi districtSantiphap Park27-05-2022 00:00-1212Very good quality
Bang Phlat DistrictRama VIII Park27-05-2022 00:00-1414Very good quality
Around the Bangkok Christian HospitalVehicle air quality monitoring registration number 742727-05-2022 00:00201717Very good quality
Pathumwan District27-05-2022 00:00-1616Very good quality
27-05-2022 00:00-1616Very good quality
25-05-2022 13:00-1313Very 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