Bangkok, Thailand. PM2.5 from 26 low-cost sensors, updated hourly.
8.7 µg/m³
Good
Latest hour (03:00 UTC), 0.6× the WHO 24-hour guideline.
Rank
24 h
–
not enough data
7 days
#1,121
of 2,341 · 7.4 µg/m³
30 days
#376
of 2,337 · 10.4 µg/m³
Year
#220
of 2,166 · 20.5 µg/m³
Why it ranks here
Cleaner than usual. The last 7 days averaged 7.4 µg/m³, well below its typical 21.8; rain or wind often clears the air for a while.
Seasonal. Over the past year its worst months were January, February, averaging up to 43.1 µg/m³ against 5.3 in its cleanest month. Seasonal peaks usually come from heating, crop burning, fire or dust seasons.
Based on Bangkok's own measurements; causes are the usual kinds for a pattern like this, not a confirmed source.
Last 4 days, hour by hour
Times in UTC. Dashed line: WHO 24-hour guideline (15 µg/m³).
Every day for a year
Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data
217 of 364 measured days were over the WHO 24-hour guideline.
Daily world rank
Rank on each day's board (1 = most polluted city that day).
2026 against 2025, month by month
Faded bars: 2025. A month shows once it has 10 measured days.
This week against past years
Mean PM2.5 for 24 Sept to 30 Sept in each year. Dashed line: WHO 24-hour guideline.
Monitors
Station
Operator
Type
Kasetsart university laboratory school 1, Chatuchak, BangkokCC BY 4.0
AirGradient
Low-cost
Watkhemapirataram school 1, Mueang, NonthaburiCC BY 4.0
AirGradient
Low-cost
Suwannaramwittayakom school 1, Bangkok Noi, BangkokCC BY 4.0
AirGradient
Low-cost
ทองหล่อ 8CC BY 4.0
AirGradient
Low-cost
Location 2603964CC BY 4.0
AirGradient
Low-cost
Soi Rimthang Rotfai 3CC BY 4.0
AirGradient
Low-cost
Soi Naradhiwas Rajanagarindra 17/1CC BY 4.0
AirGradient
Low-cost
Suriya Thep AlleyCC BY 4.0
AirGradient
Low-cost
Tang Trong Chit AlleyCC BY 4.0
AirGradient
Low-cost
Kiak Kai IntersectionCC BY 4.0
AirGradient
Low-cost
Vibhavadi Rangsit 11 Alley Lane 10CC BY 4.0
AirGradient
Low-cost
Circle Living PrototypeCC BY 4.0
AirGradient
Low-cost
MI HomeCC BY 4.0
Thung Hua Sinn Group
Low-cost
Thung Hua Sinn GroupCC BY 4.0
Thung Hua Sinn Group
Low-cost
House 45, Arden Rama 3CC BY 4.0
Mogens Christiansen
Low-cost
Soi Sukhumvit 31, High floorCC BY 4.0
Dennis
Low-cost
Nantawan Pinklao-RatchaphruekCC BY 4.0
nnarin
Low-cost
Kasetsart UniversityCC BY 4.0
HealthDEEP IRL
Low-cost
Duang Prateep Foundation HQCC BY 4.0
Duang Prateep Foundation
Low-cost
Mityothin, Chatuchak, BangkokCC BY 4.0
AirGradient
Low-cost
GappyZ HQCC BY 4.0
AirGradient
Low-cost
Soi PattanasinCC BY 4.0
AirGradient
Low-cost
THE LINE Phahonyothin ParkCC BY 4.0
AirGradient
Low-cost
Passorn 5CC BY 4.0
AirGradient
Low-cost
PalmCC BY 4.0
AirGradient
Low-cost
Cloud11CC BY 4.0
AirGradient
Low-cost
No reference monitor here, so the value is the median of low-cost sensors (at least two reporting each hour). Low-cost sensors can read high in humid air. Data via OpenAQ; licences as listed. How we rank. Embed this on your site.