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Air Quality Index (AQI) in Phra Nakhon Si Ayutthaya, Thailand 🇹🇭

Air quality in Phra Nakhon Si Ayutthaya is currently 83 on the US AQI scale, rated Moderate.

Light rain
27°C
Light rain
AQI INDEX
83
US EPA Standard

PM 2.5 Level
26.2
µg/m³

Air Quality
Moderate
The current Air Quality Index (AQI) in Phra Nakhon Si Ayutthaya is recorded at 83 as of 4:48 PM local time this Friday, July 31, 2026. This real-time AQI score is estimated from the current PM2.5 concentration. According to the US EPA health standard, air quality in Phra Nakhon Si Ayutthaya currently falls into the Moderate category. The PM2.5 pollution levels are currently measured at 26.2 µg/m³. While this AQI level is acceptable for most people, those who are unusually sensitive to air pollution should consider reducing prolonged or heavy exertion outdoors. If you are sensitive to air pollution, check the local weather before heading out. For the AQI across entire Thailand, you can also view the Air Quality Index for Thailand covering other major urban centers and local monitoring stations.

Health Recommendations for Phra Nakhon Si Ayutthaya Residents

⚠️

Air quality is acceptable. However, for some pollutants there may be a moderate health concern for a very small number of people. Sensitive groups should consider reducing prolonged outdoor exertion.

Phra Nakhon Si Ayutthaya Air Pollution: Detailed Pollutant Breakdown

🚬
Breathing Phra Nakhon Si Ayutthaya's air today is roughly like smoking 1.2 cigarettes.
Based on the Berkeley Earth estimate that ~22 µg/m³ of PM2.5 over a day is about one cigarette. Today's PM2.5 in Phra Nakhon Si Ayutthaya is 26.2 µg/m³.
PM 2.5
26.2
µg/m³
PM 10
26.5
µg/m³
Nitrogen Dioxide (NO2)
38.2
µg/m³
Ozone (O3)
9.0
µg/m³
Carbon Monoxide (CO)
1320.0
µg/m³
Sulfur Dioxide (SO2)
14.9
µg/m³

Current Weather in Phra Nakhon Si Ayutthaya

🌡️ 27°C (Feels like 31°)
🌬️ 12 km/h SW
💧 89% Humidity
🧭 1007 hPa
👁️ 10.0 km Visibility
☀️ UV Index: 0.0
🌅 Sunrise: 06:01 AM
🌇 Sunset: 06:46 PM
🌡️ Dew Point: 23°C

Phra Nakhon Si Ayutthaya's Main Air Pollutant Today

The main concern in Phra Nakhon Si Ayutthaya right now is PM2.5 at 26.2 µg/m³, about 1.7x the WHO 24-hour guideline.

Air Quality Health Advice for Phra Nakhon Si Ayutthaya

General publicAir quality is acceptable for most people. Outdoor activity is fine.
Sensitive groupsUnusually sensitive people should consider easing prolonged or heavy exertion outdoors.

Air Quality in Other Cities in Thailand

Browse Air Quality in Thailand by cities in alphabetical order:

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Air Quality in Thailand ›

Frequently Asked Questions about Air Quality in Phra Nakhon Si Ayutthaya

What is the air quality (AQI) in Phra Nakhon Si Ayutthaya right now?

The current air quality index in Phra Nakhon Si Ayutthaya is 83 — categorised as Moderate.

Is the air in Phra Nakhon Si Ayutthaya safe to breathe today?

Today's air quality in Phra Nakhon Si Ayutthaya is rated Moderate on the US EPA scale.

What is the PM2.5 level in Phra Nakhon Si Ayutthaya right now?

The fine-particle (PM2.5) concentration in Phra Nakhon Si Ayutthaya is currently 26.2 µg/m³. PM2.5 is the most health-relevant pollutant — the WHO 24-hour guideline is 15 µg/m³.

What is the PM10 level in Phra Nakhon Si Ayutthaya right now?

The coarse-particle (PM10) concentration in Phra Nakhon Si Ayutthaya is currently 26.5 µg/m³.

What is the main pollutant in Phra Nakhon Si Ayutthaya right now?

The dominant pollutant in Phra Nakhon Si Ayutthaya right now is PM2.5 at 26.2 µg/m³.

Is it safe to exercise outdoors in Phra Nakhon Si Ayutthaya today?

With air quality currently rated Moderate, outdoor exercise in Phra Nakhon Si Ayutthaya is generally considered safe for most people.

How to Read the Air Quality Index for Phra Nakhon Si Ayutthaya

Good (0-50)

Air is fresh and healthy. Safe for all outdoor activities.

Moderate (51-100)

Acceptable air quality, though sensitive groups should monitor comfort.

Unhealthy (Sensitive) (101-150)

Vulnerable groups (children, elderly) should limit outdoor exertion.

Unhealthy (151-200)

Everyone begins to experience health effects. Stay indoors where possible.

Very Unhealthy (201-300)

Significant health impact for entire population. Emergency conditions.

Hazardous (301+)

Serious health alert: everyone may experience serious life-threatening effects.

Good (0-12)

Fine particles are at minimal, safe levels. Air is optimal.

Moderate (12-35)

Acceptable air, but haze may be present in urban areas.

Sensitive (35-55)

Individuals with heart or lung disease should limit activity.

Unhealthy (55-150)

Particulate levels high enough to cause respiratory irritation.

Very Unhealthy (150-250)

Heavy haze. High risk to cardiovascular health for the public.

Hazardous (250+)

Lethal particulate concentrations. Critical neurological and lung risk.

Good (0-54)

Low levels of dust and coarse particles. Environment is safe.

Moderate (55-154)

Coarse particles may trigger coughing in sensitive groups.

Sensitive (155-254)

Visible dust pollution. Sensitive groups should avoid heavy labor.

Unhealthy (255-354)

Widespread respiratory impacts likely for the population.

Very Unhealthy (355-424)

Dangerous dust and debris levels. Significant warnings issued.

Hazardous (425+)

Extremely high concentrations. Stay inside with filtration.

Good (0-54)

Surface ozone levels are within a safe, natural range.

Moderate (55-70)

Acceptable air, but sensitive individuals may feel chest tightness.

Sensitive (71-85)

Rising ozone can trigger airway inflammation in active children.

Unhealthy (86-105)

Avoid heavy outdoor work during the hottest part of the day.

Very Unhealthy (106-200)

Serious lung function reduction likely across the public.

Hazardous (201+)

Emergency ozone levels. Risk of permanent lung tissue damage.

Good (0-53)

Nitrogen levels are optimal. Safe for everyone.

Moderate (54-100)

Typical background levels for high-density urban areas.

Sensitive (101-360)

Increased risk of respiratory infections for vulnerable groups.

Unhealthy (361-649)

Significant airway inflammation likely near traffic zones.

Very Unhealthy (650-1249)

Acute respiratory distress potential. High-risk groups stay indoors.

Hazardous (1250+)

Toxic concentrations. Immediate health precautions required.

Good (0-4.4)

Carbon Monoxide levels are clean and non-toxic.

Moderate (4.5-9.4)

Acceptable; may affect those with specific heart conditions.

Sensitive (9.5-12.4)

Reduced oxygen delivery to the heart may occur.

Unhealthy (12.5-15.4)

Headaches and fatigue may occur in urban canyons.

Very Unhealthy (15.5-30.4)

Significant cardiovascular distress. Mental confusion possible.

Hazardous (30.5+)

Lethal potential. Immediate risk of neurological collapse.

Good (0-35)

Optimal air quality with no sulfur detection.

Moderate (36-75)

Acceptable air; minor odors possible near industry.

Sensitive (76-185)

Bronchoconstriction possible for active asthmatics.

Unhealthy (186-304)

Respiratory distress likely for the wider population.

Very Unhealthy (305-604)

Significant wheezing and shortness of breath likely.

Hazardous (605+)

Extreme respiratory danger. Significant life risk.

Health & Scientific Resources

→ How to read US EPA Air Quality Index before going outside → Understanding Air Quality Index levels and what they mean → When haze forms and what it does to air quality

How is this AQI calculated?

The primary Air Quality Index (AQI) shown above is calculated using the US EPA Linear Interpolation formula based on PM2.5 concentration (Fine Particulate Matter).

Formula: Ip = [(Ihi - Ilow) / (Chi - Clow)] * (Cp - Clow) + Ilow
Current Conditions Explained

Is the AQI in Phra Nakhon Si Ayutthaya safe today?

Today's AQI is 83, which is categorized as Moderate. This means the air quality is moderate for the general population.