Definition

Milligrams per cubic meter (mg/m³) is a unit of measurement used to express the concentration of a substance, typically a pollutant, chemical, or particulate matter, in the air or another gaseous medium. It signifies the mass of a specific substance present in one cubic meter of the medium, with the substance measured in milligrams (one-thousandth of a gram).

Mathematically, mg/m³ is defined as:

1 mg/m3 = 1mg/1m3

In other words, 1 mg/m³ represents one milligram of the substance in every cubic meter of the medium. This unit is commonly used in air quality monitoring and environmental science to measure the concentration of airborne pollutants, chemicals, or particulate matter. It provides a means to quantify the presence of substances in the air at mass concentrations that can have health or environmental implications.