TABLE 2—
Associations Between Population and Pollution Characteristics and Number of PurpleAir Sensors per Census Tract for Tracts With PurpleAir Sensors and Presence or Absence of a PurpleAir Sensor in a Census Tract as of September 2020: California
| Characteristics | Association With No. of Sensors in Census Tracts With ≥ 1 Sensor Deployed, B (95% CI) | Presence or Absence of a Sensor in a Census Tract, OR (95% CI) |
| CES score | −0.03 (–0.04, −0.03) | 0.96 (0.95, 0.96) |
| Educational attainment, % | −0.04 (–0.05, −0.03) | 0.94 (0.94, 0.95) |
| Poverty, % | −0.02 (–0.03, −0.02) | 0.96 (0.96, 0.97) |
| Unemployment, % | −0.06 (–0.07, −0.04) | 0.91 (0.89, 0.92) |
| Housing burden, % | −0.02 (–0.03, −0.02) | 0.95 (0.94, 0.96) |
| Population characteristics score | −0.21 (–0.24, −0.18) | 0.72 (0.70, 0.74) |
| Race/ethnicity, % | ||
| Hispanic | −0.02 (–0.03, −0.02) | 0.97 (0.96, 0.97) |
| Non-Hispanic White | 0.01 (0.01, 0.01) | 1.03 (1.03, 1.03) |
| African American | −0.03 (–0.04, −0.01) | 0.97 (0.97, 0.98) |
| Native American | −0.04 (–0.10, 0.03) | 1.02 (0.997, 1.05) |
| Asian American | 0.00 (–0.003, 0.003) | 1.02 (1.01, 1.02) |
| Other/multiple | 0.04 (0.03, 0.06) | 1.18 (1.16, 1.21) |
| PM2.5 concentrations | −0.09 (–0.12, −0.07) | 0.70 (0.68, 0.72) |
Note. CES = CalEnviroScreen 4.0 version; CI = confidence interval; OR = odds ratio; PM2.5 = particulate matter with a diameter smaller than 2.5 µm. All models were adjusted for population density and urban–rural status.