| Region | Communities, n | Level 1 | Level 2 | Level 3 | Level 4 | Difference (level 4–1)* | |
| Current day | North 1 | 12 | 0.88 (−1.92 to 3.21) | 4.54 (1.72 to 7.38) | 5.66 (1.60 to 10.86) | 10.88 (6.54 to 16.32) | 10.0 (4.90 to 15.9) |
| North 2 | 12 | 1.81 (−1.65 to 7.07) | 4.84 (1.99 to 8.42) | 4.83 (1.51 to 8.34) | 8.24 (4.11 to 11.8) | 6.44 (0.28 to 11.37) | |
| North 3 | 12 | 1.00 (−1.61 to 3.17) | 4.54 (1.58 to 7.64) | 3.24 (−0.54 to 6.21) | 8.62 (4.32 to 12.88) | 7.62 (2.72 to 12.43) | |
| North 4 | 11 | 0.37 (−3.05 to 2.97) | 2.88 (−1.27 to 6.07) | 5.95 (2.54 to 9.90) | 7.71 (3.54 to 11.28) | 7.33 (2.30 to 12.02) | |
| South 1 | 12 | 0.62 (−3.41 to 3.74) | 5.01 (1.77 to 9.39) | 3.45 (−1.29 to 6.07) | 6.49 (0.06 to 10.64) | 5.87 (−1.48 to 11.73) | |
| South 2 | 12 | 2.15(−0.59 to 6.30) | 3.60 (−0.78 to 6.67) | 2.58 (−3.83, 7.00) | 7.70 (2.40 to 12.14) | 5.55 (−0.66 to 10.82) | |
| South 3 | 12 | 1.55 (−0.65 to 4.45) | 4.26 (1.12 to 7.32) | 3.21 (−0.95, 6.54) | 7.48 (3.27 to 10.91) | 5.93 (0.90 to 10.18) | |
| South 4 | 12 | 1.67 (−0.56 to 4.74) | 3.92 (1.02 to 6.40) | 5.17 (2.22 to 8.20) | 8.73 (6.10 to 12.21) | 7.06 (3.26 to 11.15) | |
| National | 95 | 1.27 (−0.82 to 3.39) | 4.20 (1.80 to 6.41) | 4.26 (1.27 to 7.02) | 8.23 (5.00 to 11.09) | 6.96 (3.15, 10.40) | |
| Lag 1 | North 1 | 12 | 1.03 (−1.41 to 3.31) | 4.15 (1.55 to 6.88) | 5.29 (1.20 to 10.39) | 10.27 (6.55 to 15.78) | 9.24 (4.66 to 15.02) |
| North 2 | 12 | 1.53 (−0.72 to 4.38) | 4.59 (1.79 to 8.27) | 5.03 (1.81 to 8.87) | 8.51 (5.23 to 11.79) | 6.99 (2.75 to 10.86) | |
| North 3 | 12 | 0.47 (−2.39 to 2.58) | 3.87 (1.23 to 6.41) | 2.61 (−1.33 to 5.96) | 8.87 (5.03 to 13.29) | 8.40 (4.03 to 13.36) | |
| North 4 | 11 | 0.01 (−3.47 to 2.27) | 2.81 (−1.12 to 5.39) | 5.28 (2.10 to 9.16) | 8.33 (4.94 to 11.67) | 8.32 (4.11 to 13.01) | |
| South 1 | 12 | 0.48 (−2.71 to 2.94) | 4.11 (0.90 to 7.80) | 3.20 (−1.71 to 6.80) | 7.28 (1.78 to 10.92) | 6.79 (0.78 to 11.56) | |
| South 2 | 12 | 1.51 (−1.08 to 4.95) | 3.40 (0.11 to 6.25) | 3.31 (−1.92 to 7.46) | 7.86 (2.86 to 11.68) | 6.35 (0.35 to 11.01) | |
| South 3 | 12 | 1.13 (−1.11 to 3.33) | 3.85 (1.16 to 6.56) | 3.50 (−0.45 to 6.92) | 7.60 (3.89 to 10.66) | 6.47 (2.20 to 10.31) | |
| South 4 | 12 | 1.10 (−0.81 to 3.10) | 3.25 (0.12 to 5.70) | 5.11 (2.07 to 8.31) | 8.65 (5.89 to 11.88) | 7.56 (4.03 to 11.26) | |
| National | 95 | 0.92 (−0.90 to 2.63) | 3.75 (1.61 to 5.74) | 4.16 (1.36 to 6.82) | 8.42 (5.74 to 10.98) | 7.50 (4.28 to 10.64) |
*Difference of the Bayesian meta-analysis between level 4 (highest) and level 1 (lowest) of maximum hourly ozone concentration; the values in the parentheses are 95% posterior intervals (PI).