Question

1. carbon monoxide
2. chlorofluorocarbons
3. hydrocarbons
4. lead
5. nitrous oxides
6. ozone
7. radon
8. pests
9. photosynthesis
10. sulfur

a. tetraethyl
b. pale yellow
c. 5 percent of auto exhaust
d. damages ozone layer
e. filters ultraviolet rays
f. diseases, insects, weeds
g. chlorophyll, light, carbon dioxide
h. causes death from auto exhaust
i. leaks into houses
j. pollutant from autos and factories

Explanation:

1. Carbon monoxide is a dangerous gas in auto - exhaust that can cause death, so it matches with h.
2. Chlorofluorocarbons are known for damaging the ozone layer, so it matches with d.
3. Hydrocarbons are pollutants from autos and factories, so it matches with j.
4. Tetraethyl was an additive with lead, but here lead matches with a (as tetraethyl is related to lead in this context).
5. Nitrous oxides are pollutants from autos and factories, similar to hydrocarbons in this regard, so it can match with j.
6. Ozone in the stratosphere filters ultraviolet rays, so it matches with e.
7. Radon is a gas that can leak into houses, so it matches with i.
8. Pests are related to diseases, insects, and weeds, so it matches with f.
9. Photosynthesis requires chlorophyll, light, and carbon dioxide, so it matches with g.
10. Sulfur can be a pollutant, but no specific match is given that is highly relevant among the options, but if considering general pollutant nature, it could be related to j.

Answer:

1. h
2. d
3. j
4. a
5. j
6. e
7. i
8. f
9. g
10. j