Table 1.
Empirical association between moderate resolution imaging spectroradiometer (MODIS) AOD (at 3 km spatial resolution) and PM2.5 monitored on the ground in South Florida, 2012–2016 (regression coefficient and 95% confidence interval in parenthesis).
| Variables | Regression Coefficients (95% Confidence Interval in Parenthesis) |
|---|---|
| AOD | 21.44 *** |
| (19.62–23.26) | |
| Season category (0 = October to March, 1 = otherwise) | 0.64 *** |
| (0.17–1.11) | |
| Factor of Meteorological Conditions (dominant variables atmospheric temperature and dew point) | 1.85 *** |
| (1.58–2.12) | |
| Factor of Meteorological Conditions (relative humidity) | –0.69 *** |
| (−0.89–−0.48) | |
| Constant | 7.17 *** |
| (6.81–7.52) | |
| Observations | 4398 |
| R-squared | 0.45 |
Robust 95% confidence interval in parentheses; *** p < 0.01. NOTE: To develop empirical association, AOD data points were collocated with PM2.5 monitored on the ground if the time and geographic distance between AOD and PM2.5 were ≤0.75 h (or 45 min) and ≤0.025° (~2.5 km), respectively.