PM2.5 refers to tiny particles in the air that are 2.5
micrometers or smaller in diameter—much smaller than a grain of sand. These particles come
from sources like vehicle exhaust, wildfires, and industrial emissions. Because they are so
small, they can travel deep into the lungs and even enter the bloodstream, increasing the risk of
respiratory and heart problems.
Exposure to PM may impair lung function, aggravate asthma symptoms, cause irregular
heartbeat and heart attacks, and lead to premature death in those with heart and lung diseases,
such as chronic obstructive pulmonary disease (COPD).
Our AQM 65 monitors measure Particulate Matter (PM2.5) in micrograms per cubic meter
(µg/m3).
