def

pm25

Particulate matter 2.5; atmospheric pollutant of fine particles with an aerodynamic diameter of 2.5 micrometers or less

meta

supertypes

marker

Marker labels a dict with typing information

    phenomenon

Aspect of scientific interest with measurable quantities

        substance

Matter in one the three states solid, liquid, or gas

            solid

Substance with definite shape and volume

quantities

concentration

Abundance of substance in the total volume of a mixture

temp

Temperature - measure of hot and cold

volume

Three dimensional space occupied by a substance