A massive wildfire in eastern Arizona became the state's second-largest blaze in history on Tuesday, sending smoke into nearby states, prompting health advisories in Colorado and even creating hazy conditions as far away as Iowa. The blaze has grown to almost 500 square miles, and is barreling toward more populous areas of the state. Gusts of more than 60 mph are helping it march north. The wind has made it difficult for firefighters to battle the 365-square-mile blaze since it started May 29. The fire is still considered zero percent contained.