The Clark County Department of Air Quality (DAQ) has released an online tool for mineral and aggregate processing operations to use when applying for a new, revised, or renewed air quality permit. This tool replaces DAQ's Emission Unit Worksheet for Mineral Processing and should be used in its place. The tool consists of a series of tables where emission unit information-including rating, unit type, and emission factor sources-can be specified, and emissions are then automatically calculated. The completed tables can be printed for inclusion with air quality permit applications. The new online tool is available on DAQ's website under "Mineral Processing Permitting Tool," and supplementary information about the tool can be found here. For further information, please contactEmily McKeon at (510) 285-6351.