April 22 and late-sampling spikes tied to wildfire smoke, presenter says
Summary
Wason flagged a sharp particulate spike around April 22 seen at all sites and said later wildfire smoke (identified as the Willow Fire) dominated particulate concentrations at the end of the April–June sampling period; he said the April 22 spike may trace to the Hammer Fire.
A sharp, consistent particulate spike seen across the monitoring network around April 22 drew particular attention in the April–June dataset, Roger Wason said. "By showing the peaks, we can see the unusual occurrence occurred about the April 22," he said, and later added, "We are almost certain that the effects near the end of the sample period were caused by the Willow Fire and that the pollution was channeled up the valleys and into the Aspen area."
Wason also described follow-up analysis of the April 22 spike: "While we're still exploring the peak near April 22, we have now, concluded that it might have come from the Hammer Fire." He cautioned that the available data point strongly to those regional wildfires but do not provide absolute proof; he noted EPA exceptional-event provisions apply to wildfire episodes when considering regulatory averages.
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