The U.S. Government Accountability Office (GAO) is an independent, nonpartisan agency that works for Congress. Often called the "congressional watchdog," GAO investigates how the federal government spends taxpayer dollars.
The GAO issued a report about indoor air pollution in 1991 titled "Indoor Air Pollution: Federal Efforts are Not Effectively Addressing a Growing Problem."
Then, in 2008, the GAO issued a very similar report titled "Indoor Mold: Better Coordination of Research on Health Effects and More Consistent Guidance Would Improve Federal Efforts."
So, 17 years later, they issued the 2008 report that was very similar to the 1991 report. Both reports can be found at the links provided below.
Nothing has changed, and no progress has been made.