Table 6. CO 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 ppm. The MAE was on average 0.207 ppm 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	9.47 × 10−2	3.08 × 10−1	2.07 × 10−1	86.9%
15 Days	1.12 × 10−1	3.34 × 10−1	2.11 × 10−1	85.7%
1 Month	1.25 × 10−1	3.52 × 10−1	2.21 × 10−1	83.8%
6 Months	2.42 × 10−1	4.83 × 10−1	3.28 × 10−1	72.2%
1 Year	3.07 × 10−1	5.45 × 10−1	3.87 × 10−1	72.7%