County of residence
| | | 0.29 |
Los Angeles | 114 (67.5) | 95 (56.2) | |
San Bernardino | 13 (7.7) | 15 (8.9) | |
Orange | 10 (5.9) | 14 (8.3) | |
Riverside | 12 (7.1) | 15 (8.9) | |
San Diego | 19 (11.2) | 25 (14.8) | |
Other (Ventura, Kern, Monterey) | 1 (0.6) | 5 (3.0) | |
| | | |
Distance to pollution monitor (km)
| | | 0.62 |
⩽0.5 | 63 (37.3) | 60 (35.5) | |
>0.5 to 5.0 | 61 (36.1) | 58 (34.3) | |
>5.0 to 10.0 | 26 (15.4) | 35 (20.7) | |
>10.0 to 15.0 | 10 (5.9) | 11 (6.5) | |
>15.0 | 9 (5.3) | 5 (3.0) | |
| | | |
Season of last exposure date
| | | 0.85 |
Winter (December–February) | 53 (31.4) | 47 (27.8) | |
Spring (March–May) | 58 (34.3) | 58 (34.3) | |
Summer (June–August) | 31 (18.3) | 32 (18.9) | |
Autumn (September–November) | 27 (16.0) | 32 (18.9) | |
| | | |
Last exposure date during a weekend
| 45 (26.6) | 44 (26.0) | 1.00 |