Sorry for breathing...

Half of the global population resides in cities, facing air quality issues. Air pollution is a major health threat, causing 3 million deaths annually, mostly in developing countries. Nitrogen dioxide, a dangerous pollutant from car emissions, reduces lung capacity and life expectancy. London has the highest nitrogen dioxide levels in Europe, with Oxford Street being the most polluted. The worst time for exposure in London is 10 AM.

What percentage of the world's population currently lives in cities?

• 30%

• 50%

• 70%

• 90%

What is one of the greatest external threats to health for urban dwellers?

• Water pollution

• Air pollution

• Noise pollution

• Waste management

How many people die each year from air pollution worldwide?

• 1 million

• 2 million

• 3 million

• 4 million

What pollutant is mentioned as being particularly dangerous and comes from car fumes?

• Carbon monoxide

• Sulfur dioxide

• Nitrogen dioxide

• Ozone

At what time is it considered the worst to be outside breathing in nitrogen dioxide in London?

• 8 AM

• 10 AM

• 12 PM

• 2 PM