Table 2.

Trends and uncertainties for CO datasets and eastern US AQS O3

PeriodEPA COTop-down COMOPITT COAQS COAQS O3
2005–2009−7.0%−4.5 ± 1.1%−2.7 ± 0.6%−7.9 ± 1.3%−1.6 ± 1.0%
2011–2015−4.6%−1.4 ± 1.1%−1.4 ± 0.6%−2.7 ± 1.3%−0.4 ± 0.9%
  • All trends are relative to the average of each data period (2005–2009 and 2011–2015) and based on a linear trend model. Uncertainties represent 1 σ and include the error budget discussed in SI Appendix. AQS O3 includes measurements over eastern US only (eastward of 100°W), whereas other datasets cover the whole US.