Cleaning up
America’s Air
1. illness
2. breathing
3. oxygen
4. health
5. heart
6. kidneys
7. safety
8. organ
9. lungs
10.
reaction
11.
headaches
12.
vitamin
13.
hazard
14.
substance
15.
particle
16.
smog
17.
artery
18.
ozone
19.
symptom
20.
allergy
21.
fumes
22.
protective
23.
regulations
24.
standards
25.
width