GROVELAND, Calif. — The Rim fire spread deeper into Yosemite National Park on Tuesday with flames racing unimpeded to the east even as firefighters shored up defenses for communities on the western edges of the blaze. On the positive side, a lot of people have used social media to bring help to those affected by the fire. joseph.serna@latimes.com 
 
 julie.cart@latimes.com 
 
 samantha.schaefer@latimes.com 
 
 Times staff writer Diana Marcum contributed to this report.
– The wildfire threatening Yosemite National Park is throwing so much smoke into the air that it is significantly hurting the air quality in Nevada—more than 100 miles away. Reno and Carson City issued emergency warnings over the smoke from the Rim Fire, and school children were kept inside for the second time in a week to avoid it, the AP reports. The air quality index even briefly passed the rare "hazardous" level. "It's five hours away," says one shocked resident. "I can't run. I can't breathe. It makes me sneeze." The fire is about 20% contained, but almost all of that progress has come at its southwest edge, the LA Times reports. On the east, it has a relatively flat, direct path deeper into Yosemite. "There's not a lot of real good areas to get out in there and do a lot of work," says one US Forest Service official. Meanwhile, state officials are urging residents to be wary of social media, where false rumors are spreading like, well, wildfire. Recently, for instance, "news" spread that the Groveland firehouse had burned down, which "would be a surprise to the firefighters sleeping there," a local sergeant tells the Modesto Bee.