Table 1.

Trends and uncertainties for all NOx datasets

PeriodEPA NOxTop-down NOxOMI (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.