Greg Millard found the coal dust all over the exterior of his house.
Since then, he's continued to worry about the health impacts the dust could have on him and his wife.
"My wife's got asthma," Millard said.
"I do a lot of work outside, almost 12 hours a day," he said. "Now, when the wind starts to blow, I go inside."
Millard and many of his neighbors listened to speakers like Dr. Michael Ganz, an allergy and asthma specialist based in Racine.
Ganz said there's no definitive link showing that coal dust causes long-term health consequences.
But he said, just like strong odors or smoke, coal dust can cause asthma flare-ups and exacerbations, as well as sinus or respiratory infections.
He said, since 2016, he's treated almost 50 people who live near the We Energies plant in Oak Creek.
Ganz said those people show increased incidents of asthma flare-ups and breathing problems.
"It may be a coincidence, but these people have all had visible coal dust on the outside of their homes," Ganz said.
"In my opinion, I think their exposure to this is playing an increased likelihood in these people getting sick," he added.
We Energies Director of Corporate Communications Barry McNulty issued the following statement via email:
“We have been in contact with the city of Oak Creek and the individual residents in the area. We are working one-on-one with the impacted residents of the Barton Oaks Subdivision. We also have been in communication with the city of Oak Creek, and have cleaned the playground equipment at Haas Park.
The event that occurred in early March was a rare occurrence. However, we have reevaluated our operating procedures and are making modifications to ensure this doesn't happen again. A thorough review of weather conditions, including wind speed and direction, at the start of every working shift. Action levels and alarms for wind speed will be set below the air permit requirements. In other words, our procedures will be more stringent than our air permit.
We understand that there is a desire by some residents to have an air monitor reinstalled north of the plant, and we are voluntarily making plans to do so. We also are evaluating several other measures that may provide additional screening of the coal piles.
McNulty said there's no timeline for when the additional air monitor will be installed. He said a previous monitor in that general area didn't produce significant data, so the company is working to find one that will be more effective.
"We are exploring the latest (and greatest) air monitor on the market," he said.
The company currently operates an air monitoring station to the South of the plant.
The Clean Power Coalition of Southeast Wisconsin is hosting another meeting at the library on April 4, and has invited people impacted by coal dust to attend and voice their concerns.
The group said We Energies has also been invited to attend.