Harrow Ozone (O₃) Level
United Kingdom
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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.
Most Polluted Cities 2026
United Kingdom
Analyze the real-time most air polluted cities in the country.
Standard Value
1.
Catford, Lewisham
Good
1xbelow Standard
2.
Royal Leamington Spa, Warwickshire
Good
1xbelow Standard
3.
Penicuik, Midlothian
Good
2xbelow Standard
4.
Gibraltar, Gibraltar
Good
2xbelow Standard
5.
Dollis Hill, Brent
Good
2xbelow Standard
6.
Perth, Perth And Kinross
Good
2xbelow Standard
7.
Grangemouth, Falkirk
Good
2xbelow Standard
8.
Stretford, Trafford
Good
2xbelow Standard
9.
Landore, Swansea
Good
2xbelow Standard
10.
Sheffield, Sheffield
Good
2xbelow Standard
Last Updated: 04 Jun 2026, 03:52 PM
AQI City RankingsUncovering 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.Why you should care about Ozone (O₃)?
Know More About O₃ Sensor
