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 Road02-12-2021 13:00723343Good quality
Prakanong districtWithin Prakanong District Office02-12-2021 13:00743955Medium
ฑatburana districtWithin Ratburana District Office02-12-2021 13:00703242Good quality
Rachathewi districtWithin Ratchathewi District Office02-12-2021 13:00532428Good quality
Dusit districtThe garden area opposite the Dusit District Office02-12-2021 13:00703242Good quality
Pom Prap Sattru Phai DistrictIn front of the Office of the National Economic and Social Development Board (Lan Luang intersection)02-12-2021 13:00824267Medium
Samphanthawong DistrictAround the corner Chalermprakiat Arch (Odean Circle)02-12-2021 13:00-3443Good quality
Phaya Thai DistrictFront of the Army Flats near Vichaiyut Hospital Opposite the Ministry of Finance02-12-2021 13:00-3546Good quality
Wang Thonglang DistrictIn front of Esso gas station Soi Ladprao 9502-12-2021 13:00-3546Good quality
Pathumwan DistrictIn front of Sam Yan Mitrtown mall02-12-2021 13:00-3851Medium
Bangsak DistinctBeside the police yard in front of Bang Rak Lovely Plaza02-12-2021 13:00-3546Good quality
Sathon DistrictThe intersection in front of the Sathorn District Office, Soi St. Louis Road02-12-2021 13:00-3955Medium
Yannawa DistrictNear Bank of Ayudhya, Head Office02-12-2021 13:00-3955Medium
Wattana DistrictOpposite the noble Reveal (beside MK gold restaurants)02-12-2021 13:00602833Good quality
Suan Luang DistrictIn front of Suan Luang District Office02-12-2021 13:00683341Good quality
Bang Na DistrictIn front of the mall Big C Bangna Department Store02-12-2021 13:00753750Good quality
Chatuchak DistrictIn front of Kasetsart University02-12-2021 14:00-3239Good quality
Don Mueng DistrictBeside Don Mueang District Office02-12-2021 13:00603341Good quality
Sai Mai DistrictBus stop in front of Saimai District Office02-12-2021 13:00623239Good quality
Bangkapi DistrictBeside the police fort opposite the Bang Kapi District Office02-12-2021 13:00-3955Medium
Khan Na Yao DistrictAt the entrance to Suan Siam Road intersects with Ram Inthra Road.02-12-2021 13:00623443Good quality
Lat Krabang DistrictIn front of Lat Krabang Hospital beside the police fort02-12-2021 13:00-4371Medium
Meenburi DistrictChalermprakiat Rama IX Park opposite the clock tower Opposite Min Buri District Office02-12-2021 13:00603137Good quality
Nong Chok DistrictIn front of Nong Chok District Office02-12-2021 13:00612634Good quality
Prawet DistrictIn front of Seacon Square Department Store02-12-2021 13:00723851Medium
Thon Buri DistrictAlong the bus stop in the area01-12-2021 14:00-n/an/an/a
Khlong San DistrictIn front of the library under the bridge of King Taksin Bridge02-12-2021 13:00-3851Medium
Bangkok Yai DistrictAt Tha Phra Intersection Wat Tha Phra Sub-district02-12-2021 13:00593648Good quality
Bangkok Noi DistrictIn front of Bangkok Noi Railway Police Station02-12-2021 13:00-3443Good quality
Taling Chan DistrictPhutthamonthon Sai 1 Road, intersecting with Borommaratchachonnani Road02-12-2021 13:00704267Medium
Thawi Watthana DistrictEntrance to Sanam Luang 202-12-2021 13:00754476Medium
Phasi Charoen DistrictIn front of Siam University (about Soi Phetkasem 36), the entrance to the university is about 10 meters.02-12-2021 13:00-3955Medium
Nong Khaem DistrictThree intersections, next to the police fort, Maarearoen Phetkasem Road 8102-12-2021 13:008152104Began to affect health
Bang Bon DistrictNear Bang Bon Market02-12-2021 13:00873759Medium
Thung Khru DistrictIn front of King Mongkut s University of Technology Thonburi02-12-2021 13:00593137Good quality
Phra Nakhon DistrictWithin the Phra Nakhon District Office02-12-2021 13:00-3955Medium
Huai Khwang DistrictWithin the Huai Khwang District Office (Beside the nursery) Pracha Uthit Road02-12-2021 13:00562830Good quality
Khlong Toei DistrictWithin the Khlong Toei District Office02-12-2021 13:00-3648Good quality
Bang Sue DistrictWithin Bang Sue District Office02-12-2021 13:00-3239Good quality
Ladphrao DistrictInside the Lat Phrao District Office02-12-2021 13:00693141Good quality
Laksi DistrictWithin the Laksi District Office02-12-2021 13:00-3239Good quality
Bang Khen DistrictWithin Bang Khen District Office02-12-2021 13:00-3341Good quality
Saphan Sung DistrictWithin the Saphan Sung district office02-12-2021 13:00512728Good quality
Buengkum DistrictWithin Bueng Kum District Office02-12-2021 13:00-3443Good quality
Klong Samwa DistrictWithin the Khlong Sam Wa District Office02-12-2021 13:00864059Medium
Chom Thong DistrictWithin Chomthong District Office02-12-2021 13:00502728Good quality
Bang Phlat DistrictWithin Bang Phlat District Office02-12-2021 13:00-3750Good quality
Bang Khae DistrictWithin Bang Khae District Office02-12-2021 13:00523239Good quality
Bang Khun Thian DistrictWithin Bang Khun Thian District Office02-12-2021 13:00-3341Good quality
Pathumwan Districtlumpini park02-12-2021 13:00-2323Very good quality
Chatuchak DistrictWacchirabenchatat Park02-12-2021 13:00-2933Good quality
Chatuchak DistrictChatuchak Park02-12-2021 13:00-2830Good quality
Prawet DistrictSuan Luang Rama IX02-12-2021 13:00-2830Good quality
Lat Krabang District60th Anniversary of Queen Sirikit Park02-12-2021 13:00-2728Good quality
Khlong Toei DistrictBenchasiri Park02-12-2021 13:00-2933Good quality
Buengkum DistrictNawaminpilom Park02-12-2021 13:00-3137Good quality
Thung Khru DistrictThonburirom Park02-12-2021 13:00-3137Good quality
Khlong Toei DistrictBenjakitti Park02-12-2021 13:00-2830Good quality
Chatuchak DistrictQueen Sirikit Park02-12-2021 13:00-2830Good quality
Bangkok Noi District80th Anniversary Commemoration Park02-12-2021 13:00-2626Good quality
Buengkum DistrictSiri Thai park02-12-2021 13:00-3546Good quality
Bangkae DistrictBang Khae Phirom Park02-12-2021 13:00-3341Good quality
Thawi Watthana DistrictThawee Wanarom Park02-12-2021 13:00-4059Medium
Lat Krabang DistrictPhra Nakhon Park02-12-2021 13:00-2626Good quality
Nong Chok DistrictNong Chok Park02-12-2021 13:00-2830Good quality
Bang Khen DistrictRamintra Sports Park02-12-2021 13:00-2933Good quality
Bang Kho Laem DistrictPublic Park to commemorate the sixth anniversary of His Majesty the King02-12-2021 13:00-2830Good quality
Rachathewi districtSantiphap Park02-12-2021 13:00-2728Good quality
Bang Phlat DistrictRama VIII Park02-12-2021 13:00-3035Good quality
Pathumwan District01-12-2021 18:00-3648Good quality
02-12-2021 13:00-2830Good quality
02-12-2021 13:00-2626Good 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