Smoke has a very measurable impact on air quality and contributes to both an increase in particulate matter and ozone (click here for more discussion).
Trend charts from the Utah Division of Air Quality show a gradual increase in PM2.5 over the past two days. In addition, yesterday's ozone was the highest in several days and thus far today we are running a bit higher.
|Source: Utah Division of Air Quality|
On a related subject, The Guardian reported yesterday on two studies showing an increased risk of lung cancer and heart-failure related to particulate matter exposure. One of the study's authors comments that "even modest reductions in air pollution could have major cadiovascular health benefits and substantial healthcare cost savings."
Press reports are sometimes lacking, so perhaps others with expertise in these areas can comment on the veracity of the article and the significance of the findings.