Indoor Air Quality Testing Services

Huntington Beach, California, June 4, 2025

Two of the most prevalent oxides of nitrogen are nitrogen dioxide (NO₂) and nitric oxide (NO), reports the U.S. Environmental Protection Agency (EPA). Both are toxic gases with nitrogen dioxide being a highly reactive oxidant and corrosive.

Nitrogen dioxide primarily gets into the air from the burning of fuel. It forms from emissions from vehicles, power plants, and off-road equipment. Indoors, the primary sources listed by the EPA also come from combustion processes. These include:

• Unvented combustion appliances, such as gas stoves
• Vented appliances with defective installations
• Welding
• Tobacco smoke
• Kerosene heaters

 
According to the California Air Resources Board (CARB):

A large body of health science literature indicates that exposure to NO₂ can induce adverse health effects. The strongest health evidence, and the health basis for the ambient air quality standard for NO₂, is results from controlled human exposure studies that show that NO₂ exposure can intensify responses to allergens in allergic asthmatics. In addition, a number of epidemiological studies have demonstrated associations between NO₂ exposure and premature death, cardiopulmonary effects, decreased lung function growth in children, respiratory symptoms, emergency room visits for asthma, and intensified allergic responses. 

“CARB goes on to share that indoor levels of nitrogen dioxide are determined primarily by the presence of emitting appliances, the indoor-outdoor air exchange rate, and the effects of season,” said Michael Chapman, Laboratory Manager of LA Testing’s Huntington Beach facility. “Exposure to elevated concentrations of nitrogen dioxide can also be a significant occupational hazard in some settings.”

Dedicated to identifying exposure risks to nitrogen dioxide and other airborne pollutants are the scientists at LA Testing. With multiple California laboratories, they offer air quality testing services and sampling supplies to safeguard families, workers, and building occupants. LA Testing has even sponsored an educational video about nitrogen dioxide and the indoor environment that can be seen at: https://youtu.be/4i6ng9kuLkM

To learn more about this or other environmental, health, and safety testing resources, please visit www.LATesting.com, email info@LATesting.com, or call (800) 755-1794.

  

LA Testing is California’s leading laboratory for environmental and indoor air quality testing of asbestos, mold, bacteria, lead, VOCs, formaldehyde, soot, char, ash and smoke damage, particulates and other chemicals. In addition, LA Testing offers a full range of air sampling and investigative equipment to professionals and the general public. LA Testing maintains an extensive list of accreditations including: AIHA LAP LLC., AIHA ELLAP, AIHA EMLAP and AIHA IHLAP, CDC ELITE, NVLAP, State of California, State of Hawaii Department of Health and other states. LA Testing, along with the EMSL Analytical, Inc. network, has multiple laboratories throughout California including South Pasadena, Huntington Beach, San Leandro and San Diego.