Thailand · The summary is refreshed every 15 minutes.
October 23
The air is moderate now
Bangkok
28°C
Clear
92AQI
1012hPa
Atmospheric
pressure
89%
Humidity
Bangkok, October 21, 2026: daily mean PM2.5 16 µg/m³ (27 sensors), level “Moderate” — as in the Atmy Data Hub. Now (01:00 local time): 31.2 µg/m³. Open methodology and data in JSON: Methodology and data sources · JSON
Right now in Bangkok, PM2.5 averages 31.2 µg/m³ — “moderate” on the US EPA scale (approximate, from hourly readings). Mean of 26 sensors on the Atmy network, readings from 00:46–00:56 local time (17:46–17:56 UTC), summary prepared at 01:00 local time. Median: 32.3 µg/m³; range across sensors: 1.8–45.8 µg/m³.
In Bangkok the air is moderate right now (approximate, US EPA scale). From 12:00 to 01:00 local time the city mean PM2.5 rose from 19.8 to 31.2 µg/m³.
Light wind (1 m/s) in the evening or at night, as the air cools, possibly traps particles near the ground (a temperature inversion). High humidity (89%) possibly makes optical sensors read somewhat higher.
Weather now: clear, 28°C, wind 1 m/s, humidity 89%. No major change in the wind is expected in the coming hours. By 12:00 the temperature will be about 32°C.
Written automatically at 01:00 local time (18:00 UTC) from sensor measurements and the weather forecast. Values are approximate; hypotheses are marked.
4 km/h
Wind, E
0.8 mm
Precipitation today
16 µg/m³ Moderate
Daily mean PM2.5 on October 21, 2026 (00:00–24:00 UTC): 16 µg/m³ from 27 sensors that passed the quality check — the same value as in the Atmy Data Hub.
Monthly means of quality-checked sensors, as in the Data Hub trend; the current month is still incomplete, “-” means no data.
57%An estimate of weather conditions · not a PM2.5 forecast
32°/27°
Index by time of day
60/100Moderate
Night
Morning
Day
Evening31°/26°
Index by time of day
59/100Moderate
NightMorningDayEvening31°/26°
Index by time of day
51/100Moderate
NightMorningDayEvening29°/26°
Index by time of day
50/100Moderate
NightMorningDayEvening30°/24°
Index by time of day
57/100Moderate
NightMorningDayEvening31°/23°
Index by time of day
52/100Moderate
NightMorningDayEveningForecast of conditions that trap pollution near the surface
28°
Clear. Feels like 35°C
30°C76%
32°C71%29°C86%4km/hWind from the E
4km/hWind gusts
Wind force: 1
Light wind is expected over the next few hours.
Thailand
32°C27°C
31°C26°C31°C26°C29°C26°C30°C24°C31°C23°C32°C24°C31°C25°C28°C25°C
Highest current reading: 45.8 µg/m³ (All Weather Farm). Lowest: 1.8 µg/m³ (SC #73130). The list shows every sensor, highest first.
Source: atmy.ai monitoring network
Sensors in the summary by network: AirGradient — 25 sensors, Sensor.Community — 1 sensor.
Atmy shows the networks’ readings after the Data Hub’s quality check: test devices and sensors that fail it are left out.
41
BangkokThailand
26RangsitThailand
6Khon KaenThailand
2Cities with the most sensors
All sensors on the map, by city as the map assigns them; the city’s values count only the sensors that pass the Data Hub’s quality check.
Daily mean PM2.5 of the city sensors, µg/m³
Click a day to see its date and value.
A card with the current PM2.5 in Bangkok: it is refreshed every 15 minutes and links to this page. Paste the code into your site.
Thailand · City ranking · All pilot cities
Daily mean PM2.5 on October 21, 2026 (00:00–24:00 UTC): 16 µg/m³ from 27 sensors that passed the quality check — the same value as in the Atmy Data Hub. No. 2 of 2 cities in Thailand and No. 45 of 297 worldwide, from the most polluted.
Right now in Bangkok, PM2.5 averages 31.2 µg/m³ — “moderate” on the US EPA scale (approximate, from hourly readings). Mean of 26 sensors on the Atmy network, readings from 00:46–00:56 local time (17:46–17:56 UTC), summary prepared at 01:00 local time. Median: 32.3 µg/m³; range across sensors: 1.8–45.8 µg/m³.
The current level is “moderate” (US EPA scale, approximate). Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors. This is the standard guidance of the scale, not medical advice.
Highest current reading: 45.8 µg/m³ (All Weather Farm). Lowest: 1.8 µg/m³ (SC #73130). The list shows every sensor, highest first.
From Atmy sensors and connected public networks (citizen, experimental and government monitors), aggregated by Atmy. Values are approximate; see the methodology.
The summary is rebuilt every 15 minutes from the latest reading of each sensor, each no older than one hour.
Over the last 365 days with data, the mean daily PM2.5 in Bangkok was 21.5 µg/m³ — 4.3 times the WHO annual guideline (5 µg/m³). Over the last 30 days: 17.0 µg/m³. From Atmy's archive of daily city means.
In Atmy's daily archive, the cleanest month of the last year was August 2026: 5.5 µg/m³ on average.
The most polluted month of the last year was January 2026: 41.8 µg/m³ on average.
From November to March the mean daily PM2.5 was 33.2 µg/m³, from June to August 6.6 µg/m³ (last 365 days).
The daily value is the Data Hub’s: the mean of the city’s sensors that passed the nightly quality check, each with at least 12 valid hours, and only with sensors at four places 500 m apart; days are UTC.
“Now” uses the same sensors and rule: the mean of their latest readings, each at most 60 minutes old, shown only with sensors at four places 500 m apart reporting.
Source: public Atmy monitoring data. Methodology and data sources · Data terms
