# Mass Median Aerodynamic Diameter (MMAD)

### From OpenToxipedia

Term | Mass Median Aerodynamic Diameter |
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Description | Median of the distribution of airborne particle mass with respect to the aerodynamic diameter. MMADs are usually accompanied by the geometric standard deviation (g or sigma g) which characterizes the variability of the particle size distribution. |

Definition | Mass Median Aerodynamic Diameter (MMAD)
Median of the distribution of airborne particle mass with respect to the aerodynamic diameter. MMADs are usually accompanied by the geometric standard deviation (g or sigma g) which characterizes the variability of the particle size distribution. The diameter that divides the mass distribution of an aerosol in half. |

References | 1. http://www.epa.gov/iris/help_gloss.htm#l |

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