Table 1.
Descriptive statistics of temperature, ozone concentrations, and population socioeconomic composition in each city
| City | # Counties | # ZCTAs | Temp. (F) | 8-hr max Ozonea (ppb) | Socioeconomic Composition | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| # Monitors | Mean (SD) | Min | Max | IQR | % <12th Grade Mean (SD) | % Below Poverty Mean (SD | ||||
| Atlanta | 20 | 191 | 63.1 | 12 | 42.2 (17.3) | 2.21 | 125 | 26.0 | 15.7 (8.10) | 13.1 (7.84) |
| Dallas | 12 | 253 | 68.8 | 19 | 42.0 (14.6) | 2.23 | 118 | 19.7 | 17.5 (12.1) | 14.0 (9.75) |
| St. Louis | 16 | 256 | 57.9 | 18 | 40.0 (17.3) | 0.15 | 115 | 25.4 | 15.9 (8.14) | 12.5 (9.45) |
a Daily ZCTA-specific concentrations of ambient 8-h maximum ozone. Mean, SD, min., max., and IQR are summarized across days and ZCTAs
Abbreviations: % <12th grade, percentage of the adult population (≥25 years old) with less than a 12th grade education; % below poverty, percentage of households living below the Federal Poverty Line; #, number; IQR interquartile range, Max maximum, Min minimum, ppb parts per billion, SD standard deviation; Temp average daily mean temperature in degrees Fahrenheit (F); ZCTA Zip Code Tabulation Area