The Environmental Protection Agency (EPA) sets National Ambient Air Quality Standards (NAAQS) for carbon monoxide (CO) to protect public health and the environment. Carbon monoxide is a colorless, odorless gas that reduces the blood’s ability to carry oxygen. Even at low levels, prolonged exposure can be dangerous, especially for children, pregnant women, and individuals with heart disease.
8-Hour Standard: 9 parts per million (ppm), averaged over 8 hours. This protects sensitive populations, particularly people with chronic heart disease, from long-term exposure.
1-Hour Standard: 35 ppm over 1 hour. This limits short-term exposure that can impair vision, reduce brain function, and cause dizziness or nausea.
These standards ensure that air quality in homes, schools, and workplaces remains safe for daily occupancy.
Carbon monoxide typically builds up in areas where combustion appliances are used or ventilation is poor, such as:
Homes with gas stoves, furnaces, or fireplaces
Garages where cars are left idling
Multi-family buildings with shared ventilation systems
Workplaces with industrial or mechanical equipment
Because CO is invisible and odorless, dangerous levels often go unnoticed without proper testing.
Even though EPA monitoring focuses on outdoor air quality, indoor CO exposure is often more concerning, since people spend most of their time indoors. CO testing can help identify hidden risks that threaten health and safety.
Professional CO testing can:
Detect unsafe levels before symptoms appear
Ensure compliance with EPA exposure guidelines
Protect vulnerable groups such as children and those with respiratory or heart conditions
Provide peace of mind that your home, school, or workplace air is safe
At Angstrom Testing Services, we provide reliable indoor air quality testing to evaluate carbon monoxide and other air pollutants. Our certified team uses advanced equipment to identify risks and recommend corrective actions to protect your family, employees, or tenants.
📞 Call us today at 516-724-4574 to schedule carbon monoxide air testing and make sure your environment meets EPA safety standards.
The EPA Air Quality Standard (NAAQS) for carbon monoxide is 9 parts per million. Carbon monoxide (CO) is both an asphyxiant gas and an indicator of the presence of other combustion-related vapors. Elevated levels of carbon monoxide generally result from defective combustion exhaust systems, automotive exhaust, and tobacco smoke. CO levels may vary widely from day to day and hour to hour. For premises heated with gas or oil, CO levels should always be checked during cold weather with the heating systems on to be certain that the combustion exhaust system is functioning properly. Symptoms resulting from CO exposure may include headache, dizziness, confusion, nausea and fatigue. Carbon Monoxide Air Quality Standards vary from country to country.
The EPA air quality standard for particulate matter (PM 2.5) in air is 12 micrograms per cubic meter (μg/m3).
PM stands for particulate matter (also called particle pollution): the term for a mixture of solid particles and liquid droplets found in the air. Some particles, such as dust, dirt, soot, or smoke, are large or dark enough to be seen with the naked eye. Others are so small they can only be detected using an electron microscope.
Particle pollution includes:
These particles come in many sizes and shapes and can be made up of hundreds of different chemicals.
Some are emitted directly from a source, such as construction sites, unpaved roads, fields, smokestacks or fires.
Most particles form in the atmosphere as a result of complex reactions of chemicals such as sulfur dioxide and nitrogen oxides, which are pollutants emitted from power plants, industries and automobiles.
On December 14, 2012, EPA finalized an update to the National Ambient EPA Air Quality Standard for PM2.5. The annual standard was reduced from 15 μg/m3 to 12 μg/m3. The daily PM2.5 standard and standards for PM10 were retained. The revised 2012 PM standard became effective on March 18, 2013.
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Certified Industrial Hygienist (CIH)
Indoor Air Quality Association (IAQA)
American Board of Industrial Hygiene (ABIH)
Institute of Inspection, Cleaning, Restoration & Certification (IICRC)