Interpreting Indoor Air Quality Test Results Analyzing your interior air quality readings can be made easier by referring to the benchmarks set by the Occupational Safety and Health Administration (OSHA) and the Environmental Protection Agency (EPA). Three of the most dangerous toxins are radon, carbon monoxide, and formaldehyde. Any prolonged contact with these substances can harm you or those around you. High levels of pollutants like lead, mold, pollen, dander, and dust mites in your home pose health issues. For your HVAC maintenance call us today at (626) 217-0559 to schedule a free consultation!