Mexico City sits in the bowl of an extinct volcano, often shrouded in haze. A team from UC San Diego used a forensic approach to identify some surprising sources of these aerosols. more
		Ships at sea spew sulfates into the air when they burn cheap fuel called bunker oil. Instruments at  the end of UC San Diego's Scripps pier measured surprising amounts of sulfates blowing to shore, even from vessels sailing to distant ports.  more