Airborne toxins are pollutants found in the air that can be detrimental to health. They can be in the form of particulate matter, gases, or vapors. Common airborne toxins include carbon monoxide, sulfur dioxide, nitrogen oxides, volatile organic compounds (VOCs), and particulate matter (PM10 and PM2.5). These substances can originate from both anthropogenic sources like industrial activities and natural sources such as volcanic eruptions.