What does a gas mask keep out?
disease The atmosphere heat energy air pollution energy barrier Bodily water Dehydration bacteria
A B C D E F G H
Air pollution is caused by the build-up of harmful gases and particles in the air.
A breathing mask is used for keeping air pollution from the respiratory system.
What does a gas mask keep out? (A) disease (B) The atmosphere (C) heat energy (D) air pollution (E) energy barrier (F) Bodily water (G) Dehydration (H) bacteria