What is the Current O3 Level?
Ontario
The current O3 level based on average air quality data in Ontario is 10 ppb, making it healthy and safe for everyone.
The current O3 level in Ontario is 5.1x Below the recommended WHO guideline of 50.96 ppb.
AQI Graph
Historical Air Quality Data
Ontario
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
Ontario
As per the current O3, turn off the air purifier.
Get an Air PurifierRecommendations 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)?
Know More About O3 Sensor
Air Quality FAQs
at Ontario
Frequently Asked Questions About Air Quality
What is the current O3 level in Ontario?
The current real-time O3 level in Ontario is 10 ppb (Good). This was last updated 8 minutes ago .
When was the best O3 level in Ontario in the last 24 hours?
The best O3 level was 8 ppb (Good) at 9:03 AM, Nov 17, 2024 during the last 24 hours.
When was the worst O3 level in Ontario in the last 24 hours?
The worst O3 level was 15 ppb (Good) at 4:03 PM, Nov 17, 2024 during the last 24 hours.
What is the current trend of O3 levels in Ontario during last 24 hours?
The O3 levels in Ontario have been fluctuating throughout the last 24 hours. The levels have increased by highest 15 ppb at 4:03 PM, Nov 17, 2024, lowest 8 ppb at 9:03 AM, Nov 17, 2024.
What actions are recommended as per the current O3 level in Ontario?
The air quality is satisfactory, and air pollution poses little or no risk. No special precautions are needed; enjoy outdoor activities freely.