Air Quality Index (AQI) in Iwakuni, Japan 🇯🇵

Air quality in Iwakuni is currently 58 on the US AQI scale, rated Moderate.

30°C

Moderate rain at times

The current Air Quality Index (AQI) in Iwakuni is recorded at 58 as of 7:46 AM local time this Sunday, August 9, 2026. This real-time AQI score is estimated from the current PM2.5 concentration. According to the US EPA health standard, air quality in Iwakuni currently falls into the Moderate category. The PM2.5 pollution levels are currently measured at 13.0 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 Japan, you can also view the Air Quality Index for Japan covering other major urban centers and local monitoring stations.

Health Recommendations for Iwakuni 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.

Iwakuni Air Pollution: Detailed Pollutant Breakdown

🌿

Good news — Iwakuni's air today is cleaner than a single cigarette (about 0.6).

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 Iwakuni is 13.0 µg/m³.

PM 2.5

13.0

µg/m³

PM 10

17.7

µg/m³

Nitrogen Dioxide (NO2)

14.3

µg/m³

Ozone (O3)

56.0

µg/m³

Carbon Monoxide (CO)

395.0

µg/m³

Sulfur Dioxide (SO2)

3.3

µg/m³

Current Weather in Iwakuni

🌡️ 30°C (Feels like 33°)

🌬️ 6 km/h SSE

💧 60% Humidity

🧭 1005 hPa

👁️ 10.0 km Visibility

☀️ UV Index: 2.2

🌅 Sunrise: 05:28 AM

🌇 Sunset: 07:05 PM

🌡️ Dew Point: 22°C

Iwakuni's Main Air Pollutant Today

The main concern in Iwakuni right now is PM2.5 at 13.0 µg/m³, about 0.9x the WHO 24-hour guideline.

Air Quality Health Advice for Iwakuni

General public	Air quality is acceptable for most people. Outdoor activity is fine.
Sensitive groups	Unusually sensitive people should consider easing prolonged or heavy exertion outdoors.

Air Quality in Other Cities in Japan

Browse Air Quality in Japan by cities in alphabetical order:

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Air Quality in Japan ›

Frequently Asked Questions about Air Quality in Iwakuni

What is the air quality (AQI) in Iwakuni right now?

The current air quality index in Iwakuni is 58 — categorised as Moderate.

Is the air in Iwakuni safe to breathe today?

Today's air quality in Iwakuni is rated Moderate on the US EPA scale.

What is the PM2.5 level in Iwakuni right now?

The fine-particle (PM2.5) concentration in Iwakuni is currently 13.0 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 Iwakuni right now?

The coarse-particle (PM10) concentration in Iwakuni is currently 17.7 µg/m³.

What is the main pollutant in Iwakuni right now?

The dominant pollutant in Iwakuni right now is PM2.5 at 13.0 µg/m³.

Is it safe to exercise outdoors in Iwakuni today?

With air quality currently rated Moderate, outdoor exercise in Iwakuni is generally considered safe for most people.

How to Read the Air Quality Index for Iwakuni

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 PM2.5: 13.0 µg/m³
Calculation: Your city falls into the "Moderate" category (Category 2).

Current Conditions Explained

Is the AQI in Iwakuni safe today?

Today's AQI is 58, which is categorized as Moderate. This means the air quality is moderate for the general population.