A national park in northwestern Arizona, notable for the Grand Canyon and UNESCO World Heritage status
The National Park Service has issued an extreme heat watch for the Grand Canyon’s inner canyon, predicting 105–110+ degree conditions at the bottom. Officials are urging hikers to avoid mid-day trails as several heat-related incidents have already occurred, with fatalities reported on Kaibab trails. Fire danger is rising nearby amid dry conditions.
Canadian wildfire smoke is spreading toward the Great Lakes and Northeast, pushing air quality into unhealthy ranges. Officials warn residents to stay indoors, wear masks where needed, and prepare cooling options as heat intensifies.