Particle pollution, also known as particulate matter (PM), is a general term for a mixture of solid particles and liquid droplets suspended in the air. It comes in many sizes and shapes and can contain a variety of components, including acids such as sulfuric acid; inorganic compounds such as ammonium sulfate, ammonium nitrate and sodium chloride; organic chemicals; soot; metals; soil or dust particles; and biological materials such as pollen and mould spores.
The air we breathe, both indoors and…
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