Air pollutants are divided into primary pollutants and secondary pollutants. After being discharged from the pollution source to the atmosphere, direct pollution of the air is called primary pollutants, which mainly include sulfur dioxide, carbon monoxide, nitrogen oxides, nitrogen dioxide, and particulate matter (floating dust, dustfall, soot) Etc. ), nitrogen and organic compounds containing oxygen, nitrogen, chlorine, sulfur, and radioactive substances. Secondary pollutants are due to sunlight-irradiated pollutants. Primary pollutants discharged into the environment occur under the action of physical, chemical factors or biological factors. New pollutants whose physical and chemical properties differ from primary pollutants due to changes or reactions with other substances in the environment. Based on the above definitions, Which of the following do not mention secondary pollutants:. ['The combination of sulfur dioxide emitted by volcanic eruption and oxygen in the atmosphere will form sulfuric acid mist or sulfate aerosol, causing environmental acidification, which will also affect climate change through direct or indirect radiative forcing.', 'Particulate matter is solid and liquid particles floating in the atmosphere. Particulate matter can scatter and absorb sunlight, reduce visibility, affect traffic, and increase automobile and aviation accidents.', 'Nitrogen oxides and acetaldehyde emitted from industrial production will undergo a photochemical reaction to produce peroxyacetyl sulfate, which strongly stimulates the eyes and can cause a series of symptoms such as dyspnea, heart dysfunction and lung failure.', 'Nitrogen oxides and hydrocarbons in pollutants emitted by automobile engines, upon exposure to sunlight, form photochemical smog in the atmosphere, causing great harm to the human respiratory system.']