Particulate Matter (PM) Particulate matter is a mixture of solid and liquid particles, varying greatly in size and in chemical and physical properties.
(Particulate Matter (PM) Particulate matter; is; a mixture of solid and liquid particles, varying greatly in size and in chemical and physical properties)
Particulate Matter (PM) Particulate matter
is
a mixture of solid and liquid particles, varying greatly in size and in chemical and physical properties