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FactCheck.org is celebrating 15 years of holding politicians accountable.

Did Air Quality Improve Under Obama?

EPA head Scott Pruitt criticized former President Barack Obama for leaving 40 percent of Americans with air quality that doesn’t meet EPA standards. But a report Pruitt’s office cited as evidence said there had been a “major improvement” in air quality under Obama.

FactChecking Science in 2016

We look back at some of the more questionable science-related claims from 2016 on topics such as climate change, Zika, GMOs, marijuana and the human mind.

Trump on Hairspray and Ozone

For at least five years, Donald Trump has been making false claims about hairspray and its impact on the ozone layer.