Burning produces carbon dioxide, airborne carbon particulates, carbon monoxide and nitrous oxides. Wood dust is a form of particulate matter, or particulates. Isocyanates can present respiratory hazards as particulates, vapors or aerosols. Pollutants emitted by burning coal include fine particulates (PM2.5) and ground level ozone. Sulfur dioxide emissions are a precursor to acid rain and atmospheric particulates. Target proteins are captured on the adsorbent, while particulates and contaminants pass through. Biological sources of air pollution are also found indoors, as gases and airborne particulates. The lethal concentration is a lethal dose measurement used for gases or particulates. However as both processes use atmospheric gas, they are susceptible to contamination from airborne particulates. Typically various filtration systems remove particulates, additives and oxidation products and recover the base oil. It is often used to filter hot oils, strong solvents and collecting airborne particulates. Its presence negatively impacts air quality by adding to the count of airborne particulates. The polymer precipitates as an unstable dispersion with micrometer-scale particulates. Tooth anatomy suggests consumption of gritty foods covered in particulates such as dust or dirt. These two factors result in better separation of dust particulates.