State implementation plan
Single point air monitor
Solid-phase microextraction. A method used to concentrate the components in odor samples prior to analysis.
Standard reference material
Standard temperature and pressure, dry
Relating to weather conditions that exist simultaneously over a large area.
Total ammoniacal nitrogen
Tunable diode laser spectroscopy
Teragram. 1 × 1012 g, or 1 million metric tonnes
Total Kjeldahl nitrogen
Total maximum daily load
Texas Natural Resource Conservation Commission
Tons (short) per year
Total reduced sulfur (includes H2S and mercaptans)
Total suspended particulates
The estimated amount or percentage by which an observed or calculated value may differ from the true value.
United States Code
U.S. Department of Agriculture
U.S. Department of Commerce
Volatile fatty acid
Volatile organic compound
Volatile solids. The weight lost upon ignition at 550 °C—an approximation of moisture and organic matter present (using Method 2540 E of the American Public Health Association).