What is Particle Pollution and What Types of Particles are Health Concerns?

摘要

Particle pollution, commonly referred to as particulate matter or PM, refers to a mixture of solid and liquid particles suspended in the air. Particle pollution can be made up of a variety of different components, including acids, inorganic compounds, organic chemicals, soot, metals, soil or dust particles, and biological elements, and comes in a variety of sizes and forms. Particle pollution is always present in the air we breathe, both indoors and out. Some particles are large enough to be seen with the naked eye, such as dust, dirt, soot, or smoke. Others are so minuscule that only an electron microscope can detect them.