. Author manuscript; available in PMC: 2022 Mar 16.

Published in final edited form as: Environ Sci Technol. 2021 Feb 26;55(6):3530–3538. doi: 10.1021/acs.est.0c04328

Table 5.

Cross-validation measures of predictive accuracy at AQS and fixed sites at both the two-week and long-term time scale (entire study period)

Pollutant	Model Scenario	Two-week averages			Long-term averages
Pollutant	Model Scenario	RMSE	R ² _CV	R ² _{CV reg}	RMSE	R ² _CV	R ² _{CV reg}
NO₂	Los Angeles, CA
	AQS+Fixed Site	3.56	0.81	0.82	2.21	0.83	0.85
	AQS+Fixed Site+Mobile	3.63	0.81	0.81	2.26	0.82	0.83
	AQS+Fixed Site+PSD	3.51	0.82	0.82	2.04	0.85	0.85
NO_x	Los Angeles, CA
	AQS+Fixed Site	9.65	0.84	0.84	5.34	0.85	0.87
	AQS+Fixed Site+Mobile	9.24	0.85	0.85	4.79	0.88	0.88
	AQS+Fixed Site+PSD	9.04	0.86	0.86	4.30	0.90	0.90
	Baltimore, MD
	AQS+Fixed Site	9.61	0.61	0.75	7.88	0.40	0.82
	AQS+Fixed Site+Mobile	7.07	0.79	0.79	4.28	0.82	0.85
	AQS+Fixed Site+PSD	8.56	0.69	0.78	6.64	0.58	0.86