Table 1.
Summary statistics of daily 24-hour average ambient air pollutants measured at the Atlanta Jefferson Street monitoring site during 8/14/1998–12/31/2008: total hydrocarbons, total oxygenates, 46 individual volatile organic compounds (VOCs) grouped by chemical structure, and four major pollutants that are included in analyses.a
| VOC GROUPS | INDIVIDUAL VOCs | 50th (25th, 75th) percentiles |
|
|---|---|---|---|
| TOTALHYDROCARBONSb | 92.7 (63.2, 159.3) | ||
| TOTALOXYGENATESb | 19.3 (11.8, 27.6) | ||
| HYDROCARBONS: | |||
| N-ALKANE | Ethane | 6.9 (4.9, 10.2) | |
| Propanec | 10.3 (6.5, 19.5) | ||
| n-Butane | 6.2 (3.5, 11.0) | ||
| n-Pentane | 3.2 (2.2, 5.4) | ||
| n-Hexane | 1.5 (1.0, 2.6) | ||
| n-Heptane | 0.9 (0.6, 1.5) | ||
| n-Octane | 0.5 (0.3, 0.8) | ||
| n-Nonane | 0.6 (0.4, 0.9) | ||
| n-Decane | 0.7 (0.5, 1.3) | ||
| ISO/ANTEISO-ALKANE | i-Butane | 2.3 (1.4, 4.2) | |
| i-Pentanec | 6.7 (4.3, 12.4) | ||
| 2-Methylpentane | 1.9 (1.2, 3.4) | ||
| 3-Methylpentane | 1.2 (0.8, 2.1) | ||
| 2-Methylhexane | 0.8 (0.5, 1.5) | ||
| 3-Methylhexane | 1.1 (0.7, 1.9) | ||
| 2-Methylheptane | 0.3 (0.2, 0.6) | ||
| OTHER ALKANE | 2,2-Dimethylbutane | 0.5 (0.3, 1.0) | |
| 2,3-Dimethylbutane | 0.6 (0.4, 1.1) | ||
| 2,3-Dimethylpentane | 0.5 (0.3, 1.0) | ||
| 2,4-Dimethylpentane | 0.3 (0.2, 0.7) | ||
| 2,2,4-Trimethylpentanec | 2.0 (1.2, 3.9) | ||
| 2,3,4-Trimethylpentane | 0.6 (0.3, 1.2) | ||
| 3-Ethylhexane | 0.3 (0.2, 0.6) | ||
| CYCLOALKANE | Cyclopentane | 0.3 (0.2, 0.5) | |
| Methylcyclopentanec | 0.8 (0.5, 1.4) | ||
| Methylcyclohexane | 0.5 (0.3, 0.8) | ||
| ALKENE | Ethylenec | 3.1 (2.0, 5.4) | |
| Propene | 1.4 (0.9, 2.6) | ||
| ALKYNE | Acetylenec | 4.2 (2.7, 7.6) | |
| AROMATIC | Benzene | 2.4 (1.8, 3.8) | |
| Toluenec | 7.1 (4.7, 12.5) | ||
| Ethylbenzene | 1.4 (0.9, 2.4) | ||
| n-Propylbenzene | 0.4 (0.2, 0.7) | ||
| m-Xylene & p-Xylene | 3.7 (2.2, 6.9) | ||
| o-Xylene | 1.5 (0.9, 2.8) | ||
| m-Ethyltoluene | 0.6 (0.3, 1.0) | ||
| p-Ethyltoluene | 1.3 (0.8, 2.2) | ||
| 1,2,4-Trimethylbenzened | 1.7 (1.0, 3.0) | ||
| 1,3,5-Trimethylbenzene | 0.7 (0.4, 1.2) | ||
| OXYGENATES: | |||
| ALDEHYDE | Hexanal | 0.8 (0.5, 1.1) | |
| Heptanal | 0.6 (0.4, 0.8) | ||
| Octanal | 1.2 (0.7, 1.8) | ||
| Decanal | 0.7 (0.4, 1.1) | ||
| Benzaldehydec | 1.7 (1.2, 2.5) | ||
| ACID | Acetic Acidc | 3.6 (1.5, 7.2) | |
| KETONE | 2-Butanonec | 1.7 (1.0, 2.9) | |
| MAJOR POLLUTANTS |
50th (25th, 75th) percentiles |
||
| 24-hr PM2.5 OC (µg/m3) | 3.6 (2.6, 5.0) | ||
| 1-hr max CO (ppm) | 0.69 (0.43, 1.27) | ||
| 1-hr max NO2 (ppb) | 39.3 (29.5, 50.0) | ||
| 8-hr max O3 (ppb) | 39.5 (25.7, 56.7) | ||
There were 3793 days during 08/14/1998–12/31/2008. Measurements of hydrocarbons were available for 3233 of these days, while measurements of oxygenates were available for 3231 of these days. The unit is ppb-C and the limit of detection (LOD) is 0.1 ppb-C for all VOCs. VOC concentrations below 0.1 ppb-C were replaced with 0.05 ppb-C in all analyses.
Total hydrocarbons denotes total identified non-methane hydrocarbons. Total oxygenates denotes total identified oxygenated hydrocarbons.
Species in bold text are the indicator pollutants for each VOC group.
1,2,4-Trimethylbenzene & sec-Butylbenzene