M10 refers to a type of air pollutant that consists of tiny particles measuring less than 10 microns in diameter. These particles are small enough to enter the human respiratory system and cause adverse health effects. PM10 can come from a variety of sources, including dust, pollen, smoke, and vehicle exhaust. Exposure to high levels of PM10 has been linked to respiratory problems such as asthma, bronchitis, and emphysema, as well as heart disease and even premature death. To measure PM10 levels in the air, specialized instruments are used to collect samples, which are then analyzed in a laboratory. Governments and regulatory agencies use PM10 data to monitor air quality and set limits on emissions from various sources in order to protect public health and the environment.