It's in that CARB report posted above: https://ww2.arb.ca.gov/sites/default/files/2018-11/Health%20and%20Environmental%20Impacts%20of%20Leaf%20Blowers.pdf https

It's in that CARB report posted above: https://ww2.arb.ca.gov/sites/default/files/2018-11/Health%20and%20Environmental%20Impacts%20of%20Leaf%20Blowers.pdf https://ww2.arb.ca.gov/sites/default/files/2018-11/Health%20... Compare Table 3 to Table 5. PM emissions from exhaust are on the order of 1 gram per hour. Whereas fugitive dust emissions, depending on the surface, are 100s or 1000s of grams per hour.