According to the CBS,

SAN FRANCISCO (KPIX) — A research buoy anchored off the San Francisco waterfront is raising red flags when it comes to the levels of carbon dioxide in the air we breath. Once a year, researchers pull the buoy out of the water and analyze the data it has gathered. “So when it comes up, you…

via Research Buoy Raises Red Flags About San Francisco Bay’s Health — CBS San Francisco