Most of the EPA’s Pollution Estimates Are Unreliable. So Why Is Everyone Still Using Them?

The EPA’s emission factors data, used to gauge air quality, are increasingly unreliable and in some cases based on poor accounting for emissions from aging equipment, according to a Center for Public Integrity report. The EPA rates about 62 percent of its more than 22,000 factors as “below average” or “poor.” Nearly 22 percent aren’t rated at all.