Letter D
| dB | Decibels |
| dBA | decibels on the A scale, a unit of measure of sound intensity. |
| DCO | Document Control Officer |
| DEP | diethyl phthalate |
| DEQ | Department of Environmental Quality (Oregon) |
| DFA | Department of Food and Agriculture |
| DFG | Deutsche Forschungsgemeinschaft (German Standards) |
| DFM | dust, fume, and mist. This abbreviation refers to a respirator filter cartridge suitable for use against dusts, fumes or mists, and is used in the new NIOSH regulation on Respirator Certification. |
| DHHS | Department of Health and Human Services, a Cabinet level department of the US Federal Government; the department in which CDC, and therefore NIOSH, is located |
| DHMM | Director of Hazardous Materials Management |
| DHS, DOHS | Department of Health Services |
| DIERS | Design Institute for Emergency Relief Systems - a consortium of companies under the auspices of the American Institute of Chemical Engineers (AIChE) that was formed to develop methods for the design of emergency relief systems to handle runaway chemical reactions |
| DIN | Deutsches Institut fur Normung (German Standards Institute) |
| DIPPR | Design Institute of Physical Property Data - a consortium of companies under the auspices of the American Institute of Chemical Engineers (AIChE) that sponsors the compilation, measurement, and evaluation of physical property data for industrially important compounds |
| DIS | Draft International Standards |
| DL | Driver's License |
| DM | dust and mist. This abbreviation refers to a respirator filter cartridge suitable for use against dusts and mists, and is used in the new NIOSH regulation on Respirator Certification. |
| DNFSB | Defense Nuclear Facilities Safety Board |
| DO | Dissolved Oxygen |
| DOA | Dead on Arrival |
| DOAS | Differential Optical Absorption Spectroscopy |
| DOB | Date of Birth |
| DOD | Department of Defense (Federal) |
| DOE | Department of Ecology (Washington State) |
| DOE | Department of Energy (Federal) |
| DOI | Department of the Interior (Federal) |
| DOJ | Department of Justice (California or Federal) |
| DOL | Department of Labor |
| DOP | dioctyl phthalate. The traditional test aerosol used for determining HEPA filter efficiency was an aerosolized form of warm DOP, selected because, when generated in the specified manner, the aerosol had a very narrow size distribution. |
| DOT | Department of Transportation, A US Cabinet level department |
| DPR | Department of Pesticide Regulation (Cal/EPA) |
| DRE | Destruction/Removal Efficiency |
| DSS | Department of Social Services |
| DTSC | Department of Toxic Substances Control (Cal/EPA) |
| DUR | Driving Under Revocation |
| DUS | Driving Under Suspension |
| DV | Domestic Violence |
| DVO | Diffuse Viewing Only |
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