How one restaurant's experiment may help diners breathe safely Chris Mooney, Aaron Stecklerberg and Jake Crump, The Washington Post April 23, 2021 FacebookTwitterEmail 5 1of5Guests dine outside on the deck at the Post Ranch Inn in Big Sur, California on March 1, 2021.Washington Post photo by Melina Mara.Show MoreShow Less 2of5Post Ranch Inn staff dash back and forth through a dining room equipped with a state-of-the-art air purification system designed to reduce coronavirus transmission in Big Sur, Calif., on March 1, 2021.Washington Post photo by Melina Mara.Show MoreShow Less 3of5 4of5The Post Ranch Inn's dining room is equipped with a state-of-the-art air purification system designed to reduce coronavirus transmission using an HVAC system, HEPA filters throughout the dining space, mini HEPA devices on every table, and cross ventilation mixing fresh with circulated air.Washington Post photo by Melina Mara.Show MoreShow Less