SAN DIEGO COUNTY AIR POLLUTION CONTROL DISTRICT
RULE 260.3 - ABBREVIATIONS
The abbreviations used in this regulation have the following meanings:
| ASTM | - | American Society for Testing and Materials |
| Btu | - | British thermal unit |
| oC | - | degree Celsius (centigrade) |
| cal | - | calorie |
| CdS | - | cadmium sulfide |
| cfm | - | cubic feet per minute |
| CO | - | carbon monoxide |
| CO2 | - | carbon dioxide |
| dscm | - | dry cubic meter(s) at standard conditions |
| dscf | - | dry cubic feet at standard conditions |
| eq | - | equivalents |
| oF | - | degree Fahrenheit |
| g | - | gram(s) |
| gal | - | gallon(s) |
| g-eq | - | gram equivalents |
| gr | - | grain(s) |
| hr | - | hour(s) |
| HC1 | - | hydrochloric acid |
| Hg | - | mercury |
| H2O | - | water |
| H2S | - | hydrogen sulfide |
| H2SO4 | - | sulfuric acid |
| in | - | inch(s) |
| oK | - | degree Kelvin |
| k | - | 1,000 |
| kg | - | kilogram(s) |
| l | - | liter(s) |
| lpm | - | liter(s) per minute |
| lb | - | pound(s) |
| m | - | meter(s) |
| meq | - | milliequivalent(s) |
| min | - | minute(s) |
| mg | - | milligram(s) |
| ml | - | milliters(s) |
| mm | - | millimeter(s) |
| mol. wt. | - | molecular weight |
| mV | - | millivolt |
| N2 | - | nitrogen |
| nm | - | nanometer(s) - 10-9 meter |
| NO | - | nitric oxide |
| NO2 | - | nitrogen dioxide |
| NOx | - | nitrogen oxides |
| O2 | - | oxygen |
| ppb | - | parts per billion |
| ppm | - | parts per million |
| psia | - | pounds per square inch absolute |
| oR | - | degree Rankine |
| std | - | at standard conditions |
| sec | - | second |
| SO2 | - | sulfur dioxide |
| SO3 | - | sulfur trioxide |
| µg3 | - | microgram(s) - 10-6 gram |