San Diego International Airport (SAN) is one of the many airports around the country where there’s no smoking allowed inside the terminals.

So passengers have to go outside the terminals to light up. And when they’re done, many of those smokers throw their butts on the ground.

It’s not just airports: according to folks at the Surfrider Foundation,  cigarette butts are the most littered item around the world.

So in San Diego this Saturday, November 14th, 2009, from 10 am until noon, groups of people will show up at several busy San Diego intersections – and at the San Diego International Airport – to hand out ashtrays and ask people to clean up their butts.

It’s all part of “Hold Onto your Butt” Awareness Day.