Table 1. PM_2.5 2019 model performance statistics.

The Prophet model forecasted 2019 values on an hourly basis, which was compared to actual values over a 5 day, 15 day, 1 month, and 1 year period. Units for MSE, RMSE, and MAE are µg/m³. The MAE was on average 12.6 µg/m ³ away from the actual value after 5 days and as the time increased away from the known values, the error increased.

Time	MSE	RMSE	MAE	Coverage
5 Days	3.96 × 102	1.99 × 101	1.26 × 101	85.3%
15 Days	3.92 × 102	1.98 × 101	1.27 × 101	84.4%
1 Month	4.09 × 102	2.02 × 101	1.29 × 101	83.9%
6 Months	5.57 × 102	2.35 × 101	1.51 × 101	81.0%
1 Year	6.73 × 102	2.58 × 101	1.68 × 101	79.5%