Eugene temperature records were broken Friday and Saturday, according to the National Weather Service, as the city hit 99 degrees both days.
By Saturday afternoon, the heat wave helped create smog as sunlight and wind reacted with emissions such as vehicle exhaust. The reaction produced harmful ground-level ozone, which can trigger coughing, sore throats and worsen asthma. The Lane Regional Air Protection Agency reported ozone levels were elevated but did not reach unhealthy levels.
On Sunday morning and into the early afternoon, smoky and cloudy skies rolled over Eugene and Springfield. The smoke, likely from the Flat Fire in Jefferson County, was too high to affect air quality, according to the air agency…