In terms of air quality, what do the initials "PM" stand for?

The initials "PM" stand for Particulate Matter, which refers to a mixture of tiny solid particles and liquid droplets suspended in the air. This includes a variety of components like dust, dirt, soot, and smoke, and can vary in size (measured in micrometers) and chemical composition. Particulate matter is a significant concern for air quality because it can have serious health impacts when inhaled, leading to respiratory issues, cardiovascular diseases, and other health problems.

Regulatory agencies, such as the Environmental Protection Agency (EPA), monitor PM levels to ensure they stay within safe limits, as high concentrations can indicate poor air quality and pose risks to public health. Understanding PM and its effects is crucial for environmental health professionals in assessing air quality and implementing measures to protect community health.