A Step Toward Scientific Integrity at the EPA

Scott Pruitt sweeps out Obama-era science advisers. The agency needs truly independent ones.

The EPA’s Obama -era “war on coal” rules and its standards for ground-level ozone—possibly the most expensive EPA rule ever issued—depend on the same scientifically unsupported notion that the fine particles of soot emitted by smokestacks and tailpipes are lethal. The EPA claims that such particles kill hundreds of thousands of Americans annually.

 The EPA first considered regulating fine particles in the mid-1990s. But when the agency ran its claims past CASAC in 1996, the board concluded that the scientific evidence did not support the agency’s regulatory conclusion. Ignoring the panel’s advice, the EPA’s leadership chose to regulate fine particles anyway, and resolved to figure out a way to avoid future troublesome opposition from CASAC.