This suggested that microscopic plankton living on the surface of the seas produce sulfur in the form of a gas, dimethyl sulphide, that once in the atmosphere, oxidizes and forms small particles called aerosols.

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During volcanic eruptions, huge amounts of ash and aerosols - tiny particles - can be transported into the high atmosphere which can then reflect solar radiation back into space.

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According to the 2021 lawsuit, Walmart allegedly disposed of aerosols cans, spray paints, rust removers, bleach, pesticides and over-the-counter drugs in regular trash bins, which are not permitted to receive such waste products.

FFP3s are tight-fitting masks with a built-in air filter designed to block out tiny aerosol particles which can carry the virus.