Name a waste gas released by the plants (a) only during the day time, and (b) only during the night time.

Name a waste gas released by the plants (a) only during the day time,

1.	Name a waste gas released by the plants (a) only during the day time, and (b) only during the night time.
Answer» Name a waste gas released by the plants (a) only during the day time, and (b) only during the night time.