Call: 888-217-2719 to Contact A-1 Certified Environmental Services for Mold Clearance Testing. Mold is a problem that often arises in homes and office settings. Mold thrives in moist, poorly ventilated places and can lead to health issues if not removed promptly. After testing for mold and removing it, further mold clearance testing is necessary to confirm its complete elimination. That’s where our mold clearance testing service comes into play.