Table 1.
Trends and uncertainties for all NOx datasets
| Period | EPA NOx | Top-down NOx | OMI (NASA) | OMI (DOMINO) | OMI (BEHR) | AQS NO2 |
| 2005–2009 (CONUS) | −6.4% | −7.0 ± 1.4% | −8.8 ± 1.0% | −8.6 ± 0.9% | −5.4 ± 1.0% | |
| 2011–2015 (CONUS) | −5.3% | −1.7 ± 1.4% | −1.9 ± 0.8% | −1.0 ± 0.9% | −1.0 ± 0.8% | |
| 2005–2009 (sampled) | −10.2 ± 1.8% | −9.6 ± 1.7% | −8.5 ± 1.8% | −6.6 ± 1.4% | ||
| 2011–2015 (sampled) | −3.2 ± 1.6% | −2.6 ± 1.8% | −2.1 ± 1.6% | −2.6 ± 1.5% |
All trends are relative to the average of each data period (2005–2009 and 2011–2015) cover the whole US and based on a linear trend model. Uncertainties represent 1 σ and include the error budget discussed in SI Appendix. OMI (sampled) represents OMI NO2 measurements sampled at AQS NO2 measurement locations and times based on monthly averages.