Air Quality in Chiang Mai Today — Live AQI, PM2.5 & PM10, Smog, Weather and Forecast

1 weather warning in effect for Thailand 🌧️ Heavy rain

Latest air quality data: Chiang Mai

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Pollution and air quality forecast for Chiang Mai. Today is Thursday, August 27, 2026. The following air pollution values have been recorded for Chiang Mai:

particulate matter (PM2.5) dust - 7 (Good)
particulate matter (PM10) suspended dust - 7 (Good)
ozone (O3) - 39 (Good)
nitrogen dioxide (NO2) - 10 (Good)
sulfur dioxide (SO2) - 4 (Good)
carbon monoxide (CO) - 755 (Good)

Real-time Air Quality Index (AQI) for Chiang Mai, Thursday, August 27, 2026: 1.

AQI 1 Good

What is the air quality in Chiang Mai today? Is the air polluted in Chiang Mai?. Is there smog?

Today (Thursday, August 27, 2026) air quality is good. The air quality has no effect on health. Everyone can continue their outdoor activities normally in Chiang Mai.

What is the current level of PM2.5 in Chiang Mai? (particulate matter (PM2.5) dust)
Today's PM2.5 level is: 7 (Good) For comparison, the highest level of PM2.5 in Chiang Mai in the last 7 days was: 13 (Wednesday, August 26, 2026) and the lowest: 7 (Saturday, August 22, 2026).

What is the level of PM10 today in Chiang Mai? (particulate matter (PM10) suspended dust)
The current level of particulate matter PM10 in Chiang Mai is: 7 (Good) The highest PM10 values usually occur in month: 118 (April 2016). The lowest value of particulate matter PM10 pollution in Chiang Mai is usually recorded in: September (22).

How is the O3 level today in Chiang Mai? (ozone (O3))
39 (Good)

How high is the level of NO2? (nitrogen dioxide (NO2))
10 (Good)

What is the level of SO2 pollution? (sulfur dioxide (SO2))
4 (Good)

How high is the CO level? (carbon monoxide (CO))
755 (Good)

Current data Thursday, August 27, 2026 at 8:00 AM

PM2,5 7 (Good)

PM10 7 (Good)

O3 39 (Good)

NO2 10 (Good)

SO2 4 (Good)

CO 755 (Good)

Data on air pollution from recent days in Chiang Mai

index	2026-08-27	2026-08-26	2026-08-25	2026-08-24	2026-08-23	2026-08-22	2026-08-21	2026-08-20
pm25	8 Good	13 Moderate	10 Good	11 Good	9 Good	7 Good	9 Good	10 Good
pm10	8 Good	14 Good	11 Good	15 Good	10 Good	8 Good	9 Good	11 Good
o3	40 Good	37 Good	35 Good	36 Good	41 Good	39 Good	50 Good	50 Good
no2	15 Good	17 Good	16 Good	15 Good	13 Good	14 Good	15 Good	18 Good
so2	4 Good	6 Good	5 Good	4 Good	3 Good	3 Good	5 Good	4 Good
co	1080 Good	1260 Good	1103 Good	1149 Good	930 Good	1211 Good	1354 Good	1281 Good

data source »

Air pollution in Chiang Mai from October 2015 to May 2020

index	2020-05	2020-04	2020-03	2020-02	2020-01	2019-12	2019-11	2019-10	2019-09	2019-08	2019-07	2019-06	2019-05	2019-04	2019-03	2019-02	2019-01	2018-12	2018-11	2018-10	2018-09	2018-08	2018-07	2018-06	2018-05	2018-04	2018-03	2018-02	2018-01	2017-12	2017-11	2017-10	2017-09	2017-08	2017-07	2017-06	2017-05	2017-04	2017-03	2017-02	2017-01	2016-12	2016-11	2016-10	2016-09	2016-08	2016-07	2016-06	2016-05	2016-04	2016-03	2016-02	2016-01	2015-12	2015-11	2015-10
co:ppm	0.55 (Good)	0.88 (Good)	1.1 (Good)	0.96 (Good)	0.89 (Good)	0.83 (Good)	0.84 (Good)	1.1 (Good)	0.62 (Good)	0.54 (Good)	0.46 (Good)	0.5 (Good)	0.64 (Good)	1.1 (Good)	1.2 (Good)	0.94 (Good)	0.86 (Good)	0.94 (Good)	0.84 (Good)	0.76 (Good)	0.64 (Good)	0.68 (Good)	0.69 (Good)	0.6 (Good)	0.62 (Good)	0.84 (Good)	1 (Good)	0.99 (Good)	0.9 (Good)	0.86 (Good)	0.85 (Good)	0.67 (Good)	0.57 (Good)	0.54 (Good)	0.61 (Good)	0.69 (Good)	0.65 (Good)	0.89 (Good)	0.98 (Good)	1.1 (Good)	1.1 (Good)	0.94 (Good)	0.94 (Good)	0.89 (Good)	0.99 (Good)	0.84 (Good)	0.86 (Good)	0.93 (Good)	0.89 (Good)	1.5 (Good)	1.3 (Good)	1.4 (Good)	1.1 (Good)	1 (Good)	0.89 (Good)	1.1 (Good)
so2:ppm	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)
pm10	30 (Moderate)	80 (Unhealthy for Sensitive Groups)	109 (Unhealthy)	88 (Unhealthy)	69 (Unhealthy for Sensitive Groups)	59 (Unhealthy for Sensitive Groups)	47 (Moderate)	37 (Moderate)	34 (Moderate)	29 (Moderate)	30 (Moderate)	27 (Moderate)	50 (Moderate)	83 (Unhealthy)	103 (Unhealthy)	60 (Unhealthy for Sensitive Groups)	36 (Moderate)	29 (Moderate)	30 (Moderate)	24 (Moderate)	22 (Moderate)	31 (Moderate)	36 (Moderate)	38 (Moderate)	33 (Moderate)	61 (Unhealthy for Sensitive Groups)	86 (Unhealthy)	64 (Unhealthy for Sensitive Groups)	40 (Moderate)	42 (Moderate)	39 (Moderate)	38 (Moderate)	37 (Moderate)	40 (Moderate)	36 (Moderate)	35 (Moderate)	47 (Moderate)	67 (Unhealthy for Sensitive Groups)	69 (Unhealthy for Sensitive Groups)	59 (Unhealthy for Sensitive Groups)	36 (Moderate)	39 (Moderate)	32 (Moderate)	29 (Moderate)	28 (Moderate)	30 (Moderate)	28 (Moderate)	25 (Moderate)	50 (Moderate)	118 (Very Unhealthy)	107 (Unhealthy)	82 (Unhealthy)	58 (Unhealthy for Sensitive Groups)	47 (Moderate)	35 (Moderate)	48 (Moderate)
no2:ppm	- (Good)	- (Good)	0.02 (Good)	0.03 (Good)	0.03 (Good)	0.02 (Good)	0.02 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.02 (Good)	0.03 (Good)	0.03 (Good)	0.02 (Good)	0.02 (Good)	0.02 (Good)	0.01 (Good)	0.01 (Good)	0.03 (Good)	0.05 (Good)	0.01 (Good)	0.01 (Good)	0.02 (Good)	0.03 (Good)	0.02 (Good)	0.02 (Good)	0.02 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.02 (Good)	0.02 (Good)	0.04 (Good)	0.01 (Good)	0.02 (Good)	0.02 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.02 (Good)	0.03 (Good)	0.03 (Good)	0.03 (Good)	0.02 (Good)	0.02 (Good)	0.02 (Good)	0.02 (Good)

data source »

Quality of life in Chiang Mai

Green and Parks in the City

Chiang Mai 43%

laoPDR: 37% Cambodia: 36% Vietnam: 42% Myanmar: 33% Malaysia: 54%

particulate matter PM2.5

Chiang Mai 25 (Moderate)

Pleasure of spending time in the city

Chiang Mai 32%

laoPDR: 38% Cambodia: 32% Vietnam: 30% Myanmar: 24% Malaysia: 48%

particulate matter PM10

Chiang Mai 46 (Moderate)

Air Pollution

Chiang Mai 81%

laoPDR: 72% Cambodia: 68% Vietnam: 78% Myanmar: 83% Malaysia: 53%

Garbage Disposal

Chiang Mai 51%

laoPDR: 20% Cambodia: 25% Vietnam: 24% Myanmar: 12% Malaysia: 47%

Availability and quality of drinking water

Chiang Mai 55%

laoPDR: 51% Cambodia: 48% Vietnam: 43% Myanmar: 34% Malaysia: 56%

Cleanliness and tidiness

Chiang Mai 49%

laoPDR: 32% Cambodia: 25% Vietnam: 29% Myanmar: 18% Malaysia: 47%

Noise and Light pollution

Chiang Mai 55%

laoPDR: 55% Cambodia: 59% Vietnam: 65% Myanmar: 52% Malaysia: 49%

Water Pollution

Chiang Mai 60%

laoPDR: 73% Cambodia: 73% Vietnam: 73% Myanmar: 74% Malaysia: 62%

Source: Numbeo

Chiang Mai

Thursday, August 27, 2026 at 8:00 AM

PM2,5 6.7 (Good)

particulate matter (PM2.5) dust

PM10 6.9 (Good)

particulate matter (PM10) suspended dust

O3 39 (Good)

ozone (O3)

NO2 10 (Good)

nitrogen dioxide (NO2)

SO2 3.6 (Good)

sulfur dioxide (SO2)

CO 755 (Good)

carbon monoxide (CO)

Chiang Mai

index	2026-08-20	2026-08-21	2026-08-22	2026-08-23	2026-08-24	2026-08-25	2026-08-26	2026-08-27
pm25	10	9.2	6.9	8.9	11	9.7	13	8
pm10	11	9.4	7.8	10	15	11	14	8.2
o3	50	50	39	41	36	35	37	40
no2	18	15	14	13	15	16	17	15
so2	4.2	4.8	3.4	3.4	4.1	4.5	5.9	3.7
co	1281	1354	1211	930	1149	1103	1260	1080

Si Phum, Mueang

index	2020-05	2020-04	2020-03	2020-02	2020-01	2019-12	2019-11	2019-10	2019-09	2019-08	2019-07	2019-06	2019-05	2019-04	2019-03	2019-02	2019-01	2018-12	2018-11	2018-10	2018-09	2018-08	2018-07	2018-06	2018-05	2018-04	2018-03	2018-02	2018-01	2017-12	2017-11	2017-10	2017-09	2017-08	2017-07	2017-06	2017-05	2017-04	2017-03	2017-02	2017-01	2016-12	2016-11	2016-10	2016-09	2016-08	2016-07	2016-06	2016-05	2016-04	2016-03	2016-02	2016-01	2015-12	2015-11	2015-10
no2:ppm	-	-	0.02	0.03	0.03	0.02	0.02	0.01	0.01	0.01	0.01	0.01	0.01	0.02	0.03	0.03	0.02	0.02	0.02	0.01	0.01	0.03	0.05	0.01	0.01	0.02	0.03	0.02	0.02	0.02	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.02	0.02	0.04	0.01	0.02	0.02	0.01	0.01	0.01	0.01	0.01	0.02	0.03	0.03	0.03	0.02	0.02	0.02	0.02
so2:ppm	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
pm10	30	80	109	88	69	59	47	37	34	29	30	27	50	83	103	60	36	29	30	24	22	31	36	38	33	61	86	64	40	42	39	38	37	40	36	35	47	67	69	59	36	39	32	29	28	30	28	25	50	118	107	82	58	47	35	48
co:ppm	0.55	0.88	1.1	0.96	0.89	0.83	0.84	1.1	0.62	0.54	0.46	0.5	0.64	1.1	1.2	0.94	0.86	0.94	0.84	0.76	0.64	0.68	0.69	0.6	0.62	0.84	1	0.99	0.9	0.86	0.85	0.67	0.57	0.54	0.61	0.69	0.65	0.89	0.98	1.1	1.1	0.94	0.94	0.89	0.99	0.84	0.86	0.93	0.89	1.5	1.3	1.4	1.1	1	0.89	1.1

* Pollution data source: https://openaq.org (Thailand) The data is licensed under CC-By 4.0

🌦️ Weather · 16-day Forecast — Thailand

16-day weather forecast for Thailand: today around 30°C (rain), lows near 27°C. Daily temperature and conditions, updated every day. Strong wind (about 21 km/h) is actively clearing smog and dust away.

☀️ UV Index · 16-day Forecast — Thailand

The UV index in Thailand today is 8.1 (very high) — unprotected fair skin can burn in about 25 minutes.

📍 Air quality in nearby cities

Live PM2.5 around Chiang Mai — compare nearby locations.

Bangkok 3 µg/m³
Samut Prakan Province 3 µg/m³
Udon Thani 7 µg/m³
Chonburi 1 µg/m³
Nakhon Ratchasima 2 µg/m³
Hat Yai 13 µg/m³
Pak Kret 11 µg/m³
Si Racha 1 µg/m³

Frequently asked questions

Is the air safe to breathe in Chiang Mai today?

The current average PM2.5 across Chiang Mai is about 7 µg/m³, rated “Good”. Air quality is good — outdoor activities are fine for everyone.

What is the current PM2.5 level in Chiang Mai?

Right now PM2.5 in Chiang Mai averages about 7 µg/m³ (“Good”). PM2.5 are fine particles small enough to reach the lungs and bloodstream.

Which day last week had the worst air in Chiang Mai?

Over the past week, the highest daily PM2.5 in Chiang Mai was recorded on Wednesday, August 26 (about 13 µg/m³).

What is the UV index in Chiang Mai today?

The UV index in Chiang Mai today is 8.1 (very high) — unprotected fair skin can burn in about 25 minutes.

Does today's wind help disperse smog in Chiang Mai?

Strong wind (about 21 km/h) is actively clearing smog and dust away.

How is air quality measured?

Air quality here is based on PM2.5 — the concentration of fine particulate matter in µg/m³. Lower values mean cleaner air. Data is updated daily from Open-Meteo.