1.
Fine Particles (PM2.5) are less harmful because they are small and can't penetrate deeply into our lungs.
2.
Which of the following pollutants are considered major risk factors for human health?
3.
What is the Air Quality Index (AQI) range that indicates a "Health Emergency Alert"?
4.
Using a mask is a foolproof solution to protect a person from air pollution.
5.
What are the WHO Global Air Quality Guidelines established for?
