Pm stands for particulate matter: the term for a mixture of solid particles and liquid droplets found in the air. some particles, such as dust, dirt, soot, or smoke, are large or dark enough to be seen with the naked eye. other particles are so small they can only be detected using an electron microscope. particulate matter contains microscopic solids or liquid droplets that are so small that they can be inhaled and cause serious health problems. all but one is a condition of the lungs as a result of pm
a) heart arrhythmia
b) aggravated asthma
c) chronic bronchitis
d) reduced lung function