12/27 2011
In 2007, high levels of bromate—a carcinogen formed when bromide and chlorine react with sunlight—were found in Los Angeles’s Ivanhoe Reservoir. Today three million black plastic balls help deflect UV rays.
(via Ivanhoe Reservoir Picture – Los Angeles Photo - National Geographic Photo of the Day)

In 2007, high levels of bromate—a carcinogen formed when bromide and chlorine react with sunlight—were found in Los Angeles’s Ivanhoe Reservoir. Today three million black plastic balls help deflect UV rays.

(via Ivanhoe Reservoir Picture – Los Angeles Photo - National Geographic Photo of the Day)