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Humans are the main indoor source of carbon dioxide (CO 2) in most buildings. Indoor CO 2 levels are an indicator of the adequacy of outdoor air ventilation relative to indoor occupant density and metabolic activity. Indoor CO 2 levels above 500 ppm can lead to higher blood pressure and heart rate, and increased peripheral blood circulation. [85]
Keeping the air inside your home healthy depends on knowing the reasons it turns bad in the first place.
New studies show that CO2 inside buildings could be just as harmful as outside. Skip to main content. 24/7 Help. For premium support please call: 800-290-4726 more ways to reach us ...
A recent study of 163 households in two rural Chinese counties reported geometric mean indoor PM 2.5 concentrations of 276 μg/m 3 (combinations of different plant materials, including wood, tobacco stems, and corncobs), 327 μg/m 3 (wood), 144 μg/m 3 (smoky coal), and 96 μg/m 3 (smokeless coal) for homes using a variety of different fuel ...
Researchers found elevated levels of metals and polycyclic aromatic hydrocarbons (PAHs) in ash, in addition to volatile organic compounds (VOCs) in air samples inside people’s homes.
Carbon dioxide is the lasing medium in a carbon-dioxide laser, which is one of the earliest type of lasers. Carbon dioxide can be used as a means of controlling the pH of swimming pools, [139] by continuously adding gas to the water, thus keeping the pH from rising. Among the advantages of this is the avoidance of handling (more hazardous) acids.
Houseplants do have a statistically significant effect on the concentrations of both carbon monoxide and carbon dioxide in normal indoor environments, reducing carbon dioxide levels by 10–25% and carbon monoxide levels by up to 90%. [49]
Carbon dioxide emissions from human activities are the primary cause of ocean acidification, with atmospheric carbon dioxide (CO 2) levels exceeding 422 ppm (as of 2024). [69] CO 2 from the atmosphere is absorbed by the oceans.
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