 up until a few years ago. And so we didn't have the ability to do this type of measurement. But also to be clear, the infrastructure nationally for measuring hazardous air pollutants is not as strong as the infrastructure measuring things like particulate matter or NOx or carbon monoxide. And so the hazardous air pollutants are a different category. They're much more difficult to measure. And there's a lot fewer sites across the U.S. measuring these hazardous air pollutants. So what we found in Louisiana isn't necessarily unique to Louisiana.