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Decreasing trends of elemental carbon (EC) have been reported at US Interagency Monitoring of PROtected Visual Environments (IMPROVE) network from 1990 to 2004, consistent with the phase-in of cleaner engines, residential biomass burning technologies, and prescribed burning practices. EC trends for the past decade are examined due to an upgrade of IMPROVE carbon instruments and the thermal/optical analysis protocol since 2005. Filter reflectance (&tau;R) values measured as part of the carbon analysis were retrieved from archived data and compared with EC for 65 sites with more complete records within 2000–2009. EC–&tau;R relationships suggest minor changes of EC quantified by the original and upgraded instruments for most IMPROVE samples. EC and &tau;R show universal decreasing trends across the US. The EC and &tau;R trends are correlated, with national average downward rates (relative to the 2000–2004 baseline medians) of 4.5% yr−1 for EC and 4.1% yr−1 for &tau;R. The consistency between independent EC and &tau;R measurements adds to the weight of evidence that EC reductions are real rather than an artifact of changes to the measurement process

Consistency of long-term elemental carbon trends from thermal and optical measurements in the IMPROVE network