Is Barbara Boxer suggesting that air containing 400 ppm of CO2 is "dirty"?

Senator Barbara Boxer calls out GOP on environmental policies | ZAGASI

“If anyone in Congress tries to move to a dirty-air policy, I will take them straight to the American people and do everything in my power to stop them,” Boxer, a Democrat, pledged at a news conference.

Carbon Dioxide Comfort Levels

maximum allowed concentration within a 8 hour working period: 5000 ppm