What is the Current O3 Level?
Ansan
The current O3 level in Ansan based on the average air quality level across the city is 62 ppb making it acceptable, but sensitive individuals should be cautious.
The current O3 level in Ansan is 1.22x Above the recommended WHO guideline of 50.96 ppb.
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AQI Graph
Historical Air Quality Data
Ansan
Download 2024 Annual Data
World Air Quality Report
Do you know that Ozone's total mass is 3 billion metric tons in the atmosphere? It looks like a lot but has only 0.00006% of the atmosphere. Besides, Ozone's peak concentration is 32 kilometres above the Earth's surface.
Uncovering the Sources of Ozone (O3): Where Does It Come From?
Refineries
Industrial processes emit substances.
Power plants
Emissions from burning fossil fuels.
Paints evaporations
Vocs from paints react with sunlight.
Transportation
Diesel operated vehicles reacts and form ozone.Short-Term O3 Exposure Impacts
Chest pain
Discomfort or pain in the chest due to respiratory stress.
Breathing shortness
Difficulty in breathing or feeling of breathlessness.
Respiratory irritation
Inflammation and irritation of the respiratory tract.
Wheezing and coughing
Whistling sound and persistent cough.
Trigger asthma attacks
Aggravation of asthma symptoms.Health Advice Based on Current O3 Level In
Ansan
Air PurifierTurn On
Car FilterMust
N95 MaskMust
Stay IndoorMust
Must turn on the air purifier to enjoy fresh air.
Recommendations by 
O3 Monitor
Check real-time O3 levels to ensure you're breathing clean air.
O3 Sensor
Monitor 03 level in your area to stay safe with 03 sensor.
Car Filter
Trap particles before they enter your vehicle, ensuring a safe and healthy ride.
N95 Mask
Protect yourself from harmful airborne particles by wearing an N95 mask.
Why you should care about Ozone (O3)?
Air Quality FAQs
at Ansan
Frequently Asked Questions About Air Quality
What is the current O3 level in Ansan?
The current real-time O3 level in Ansan is 62 ppb (Moderate). This was last updated 2025-06-05 02:10:19 PM (Local Time).
When was the best O3 level in Ansan in the last 24 hours?
The best O3 level was 32 ppb (Good) at 10:09 AM (Local Time) during the last 24 hours.
When was the worst O3 level in Ansan in the last 24 hours?
The worst O3 level was 62 ppb (Moderate) at 1:09 PM (Local Time) during the last 24 hours.
What is the current trend of O3 levels in Ansan during last 24 hours?
The O3 levels in Ansan have been fluctuating throughout the last 24 hours. The levels have increased by highest 62 ppb at 1:09 PM (Local Time), lowest 32 ppb at 10:09 AM (Local Time).
What actions are recommended as per the current O3 level in Ansan?
Current O3 levels are acceptable; however, some pollutants may be a concern for a small number of sensitive individuals.