The board says the new rules will reduce smog-forming emissions by 75 percent by 2025 compared to 2014. Greenhouse gas emissions would be reduced by 50 percent compared to today.
The Board's Chairwoman is Mary Nichols. She says the agreement between the states and the automakers is "historic."
NICHOLS: "It's been the result of years of hard work and a real change in attitude I think on the part of automakers who have seen the handwriting on the wall that their future lies in these advanced vehicles."
The regulations mandate that 15 percent of new cars sold in California by 2025 be plug-in hybrids or zero emissions vehicles. Nichols says that number can be increased with properly placed incentives.
NICHOLS: "Additional incentives that will make it easier and simpler for people who want to move into a new era of plug-in vehicles.
The new emissions standards will mean the cost of a new car will go up by $1900 by 2025, but the board says owners will recoup that amount in fuel savings within three years.
Nichols says the regulations enacted today will prevent 870 million metric tons of automobile pollution by 2050.