If the amount of carbon dioxide (CO2) in a workplace is greater than 1000 ppm it can cause drowsiness and complaints of stale air. Write an equality to show the amount of (c) and parts per million that would represent a safe work environment.

C > 1000 ppm

C < 1000 ppm

C Greater than equal to 1000 ppm

C less than equal to 1000 ppm