Required Outdoor Air Sample:
On one cassette, mark the box labeled “Outside Sample.”(This will be your REQUIRED control sample.)
Ensure you have a power outlet to plug into. You may need an extension cord.
Take a sample when it’s not raining or snowing, in an open area 10 ft. away from the structures and overhangs, 3 to 5 ft. off the ground. (Use a chair to set the pump on.)