| Main Entry: | carbon dioxide |
| Part of Speech: | noun |
| Definition: | colorless odorless gas |
Synonyms: |
CO2, carbonic acid, carbonic acid gas |
| Notes: | carbon dioxide is the gas we exhale and carbon monoxide is the gas in car exhaust |
| Main Entry: | smog |
| Part of Speech: | noun |
| Definition: | air pollution |
Synonyms: |
acid rain, carbon dioxide, fog, haze, smoke, soot |