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Workbook Acronyms and Definitions
Note: EPA no longer updates this information, but it may be useful as a reference or resource.
| 2DDP | 2-dimensional data plane |
| AIRS | Aerometric information retrieval system |
| agl | Above ground level |
| ARIMA | Auto-regressive integrated moving average |
| bscat | Light-scattering coefficient |
| CALC | Calculated species mass (CMB model output) |
| CALMET | Diagnostic meteorological model |
| CALRAMS | Prognostic meteorological model |
| CBL | Convective boundary layer |
| CBIV | Carbon bond IV chemical reaction mechanism scheme |
| C/M | Calculated/measured (CMB model output) |
| CMB | Chemical mass balance |
| CMSA | Consolidated metropolitan statistical area |
| Cn2 | Radar profiler reflectivity |
| CNG | Compressed natural gas |
| CV | Coefficient of variation |
| DF | Degrees of freedom |
| E | Extent of reaction |
| GRACE | Graphical ratio analysis for composition estimates |
| H2O2 | Hydrogen peroxide |
| HCHO | Formaldehyde |
| HNO3 | Nitric acid |
| LAA | Lowest altitude average |
| Level 0 Data Validation | Conversion of instrument output voltages to their scaled scientific units using nominal calibrations. May incorporate data logger inserted flags. |
| Level 1 Data Validation | Observations have received quantitative and qualitative reviews for accuracy, completeness, and internal consistency. Final audit reviews required. |
| Level 2 Data Validation | Measurements are compared for external consistency against other independent data sets (e.g., comparing surface ozone concentrations from nearby sites, intercomparing rawindsonde and radar profiler winds, etc.). |
| Level 3 Data Validation | Observations are determined to be physically, spatially, and temporally consistent when interpretive analyses are performed during data analysis. |
| LMAQR | Lake Michigan air quality region. |
| LMOS | Lake Michigan Ozone Study |
| LPG | Liquefied petroleum gas |
| LQL | Lower quantifiable limit |
| LT | Local time |
| MDL | Minimum detection limit |
| MEAS | Measured species mass (CMB model output) |
| MIR | Maximum incremental reactivity |
| MLA | Mixed layer average |
| MPIN | Modified pseudo-universe matrix |
| MSA | Metropolitan statistical area |
| MW | Molecular weight |
| NAAQS | National ambient air quality standard |
| NARSTO | North American Research Strategy for Tropospheric Ozone |
| NBL | Nocturnal boundary layer |
| NMHC | Nonmethane hydrocarbons. Sum of identified species and unidentified mass from C2 through C12. |
| NMOC | Nonmethane organic compounds (NMHC+carbonyl compounds) |
| NOx | NO + NO2 + poorly defined fraction of other NOx species (given conventional analyzers) |
| NOy | = NOx + HNO3 + organic nitrates + inorganic
nitrates = NOx + NOz |
| NOz | Oxidation products of NOx NOy x (1-NOx/NOy) |
| NWS | National Weather Service |
| OBM | Observational-based Model |
| OTAG | Ozone Transport Assessment Group |
| Outliers | Data physically, spatially, or temporally inconsistent. |
| OTR | Ozone transport region |
| PAMS Target Species | 55 C2-C12 hydrocarbons 3 carbonyl compounds |
| PAN | Peroxyacetylnitrate |
| PCA | Principal component analysis |
| Photochemical Age | Fraction of initial NOx emissions that have been photo oxidized = 1 - NOx/NOy |
| QA | Quality assurance |
| QC | Quality control |
| RADAR | Radio detection and ranging |
| RASS | Radio acoustic sounding systems |
| RF | Radio frequency |
| RHC | Reactive hydrocarbons |
| ROM | Regional oxidant model |
| R/U | Residuals/uncertainties (CMB model output) |
| SAFER | Source apportionment by factors with explicit restrictions |
| SCAQS | South Coast Air Quality Study |
| SCE | Source contribution estimate |
| SIP | State Implentation Plan |
| SODAR | Sound detection and ranging |
| SP | Smog produced |
| SPA | Smog production algorithm |
| ST | Standard time |
| STDERR | Standard error |
| TMB | Trimethylbenzene |
| Tv | Virtual temperature |
| UAM | Urban Airshed Model IV = EPA regulations version using CBIV Urban Airshed Model V = with variable grid |
| VOC | Volatile organic compounds (used in this presentation interchangeably with NMOC) |
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