Ozone is a gas comprised of three oxygen (O3) atoms. It is unstable and reacts easily to other gases. In its natural state, it is a component in several levels of the atmosphere. At high altitudes ...

Smoke from wildfires in northern Quebec in Canada covered the city of Montreal ... to the city’s air becoming the world’s most polluted, according to an air quality index.

On the heels of Montreal recently named one of the best ... selected from the 385 airlines it tracks. Air New Zealand ranked the safest top full-service airline in 2025. Air New Zealand narrowly ...