ISO 14644-1 classifies cleanroom air cleanliness by the maximum allowable concentration of airborne particles. The classification, from ISO 1 to ISO 9, is determined by the formula [látex]C_N = 10^N \times (\frac{0.1}{D})^{2.08}[/latex], where [latex]C_N[/latex] is the max concentration of particles/m³, N is the ISO class number, and D is the particle size in µm.
