Des Moines, IA – The Air Quality Bureau has recorded 33 exceedances of the National Ambient Air Quality Standards (NAAQS) over the last 14 days. Smoke from wildfires in Northern Canada contributed to 32 ozone exceedances and one fine particulate matter (PM2.5) exceedance between May 18th and May 31st. Iowa has averaged less than four ozone exceedances per year over the last five years. These exceedances are the first of the NAAQS measured in Iowa this year.