Atmospheric particulate matter refers to tiny solid or liquid particles that are suspended in the air. These particles are often referred to as aerosols, and they can have a variety of sources, ranging from natural events like dust storms and volcanic eruptions to human activities like burning fossil fuels and operating heavy machinery. Synonyms for atmospheric particulate matter include air pollution, airborne particles, fine particulate matter, PM, and smog. These terms are commonly used in discussions about the health and environmental impacts of airborne particulate matter. It is important to understand and monitor the levels of these particles in the atmosphere to protect human health and the environment.