Table 1. Influence of TROPOMI Pixel Area and Sampling Coverage on Both Mean and Individual Daily Relative Inequalities (May 2018–September 2021) and Comparison between Mean Daily and Oversampled Relative Inequalities for Black and African Americans, Hispanics and Latinos, and Asians Compared to Those for Non-Hispanic/Latino Whites, for below Poverty versus above Poverty Tracts, and for LIN Compared to HIW Tractsa.
| mean
of daily inequalities |
daily
inequalities |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| relative
inequalities (%) |
coefficient
of variation |
|||||||||
| pixel area (km2) | Black and African Americans | Hispanics and Latinos | Asians | below poverty tracts | LIN tracts | Black and African Americans | Hispanics and Latinos | Asians | below poverty tracts | LIN tracts |
| 20–25 | 31 ± 2 | 30 ± 2 | 28 ± 2 | 28 ± 2 | 40 ± 3 | 0.44 | 0.52 | 0.43 | 0.45 | 0.40 |
| 25–30 | 32 ± 3 | 30 ± 3 | 28 ± 2 | 26 ± 3 | 39 ± 3 | 0.45 | 0.53 | 0.42 | 0.52 | 0.41 |
| 30–35 | 31 ± 3 | 29 ± 3 | 30 ± 2 | 26 ± 2 | 38 ± 3 | 0.42 | 0.42 | 0.32 | 0.43 | 0.37 |
| 35–45 | 31 ± 2 | 26 ± 3 | 28 ± 2 | 25 ± 3 | 38 ± 3 | 0.37 | 0.62 | 0.34 | 0.53 | 0.41 |
| 45–60 | 30 ± 3 | 27 ± 3 | 28 ± 3 | 25 ± 2 | 38 ± 4 | 0.54 | 0.60 | 0.51 | 0.53 | 0.53 |
| >60 | 26 ± 3 | 25 ± 3 | 23 ± 2 | 22 ± 2 | 31 ± 3 | 0.47 | 0.60 | 0.49 | 0.50 | 0.43 |
| UA coverage (%) | ||||||||||
| <30 | 12 ± 2 | 11 ± 2 | 10 ± 2 | 11 ± 4 | 18 ± 4 | 1.99 | 2.00 | 2.05 | 2.47 | 1.81 |
| 30–60 | 30 ± 3 | 29 ± 3 | 26 ± 3 | 25 ± 3 | 37 ± 4 | 0.64 | 0.62 | 0.65 | 0.66 | 0.65 |
| >60 | 30 ± 1 | 28 ± 1 | 28 ± 1 | 26 ± 1 | 38 ± 1 | 0.40 | 0.53 | 0.36 | 0.45 | 0.36 |
| mean of daily inequalities | oversampled inequalities | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| all days | 24 ± 1 | 22 ± 1 | 21 ± 1 | 21 ± 1 | 32 ± 1 | 28 ± 1 | 27 ± 1 | 28 ± 1 | 25 ± 1 | 36 ± 2 |
| >30% | 30 ± 1 | 28 ± 1 | 28 ± 1 | 25 ± 1 | 38 ± 1 | 28 ± 1 | 27 ± 1 | 28 ± 1 | 25 ± 1 | 35 ± 2 |
| >60% | 30 ± 1 | 28 ± 1 | 28 ± 1 | 26 ± 1 | 38 ± 1 | 28 ± 1 | 26 ± 1 | 28 ± 1 | 25 ± 1 | 36 ± 2 |
a
The pixel area analysis only includes days with >30% UA coverage. Observations are grouped such that each category contains at least 80 observation days. Inequalities are binned by days with low (<30%), moderate (30–60%), and high (>60%) UA coverage. Daily inequalities are assessed using the coefficient of variation. Errors are 95% confidence intervals based on bootstrapped distributions sampled with replacement 104 times. The oversampled TROPOMI TVCDs are oversampled to 0.01° × 0.01° prior to census tract averaging for all days, on days with >30% coverage, and on days with >60% coverage, with uncertainties as standard mean errors.