What you need to know

• The Bridge Fire above Glendora became the largest active wildfire in California, burning 120,000 acres.
• The Line Fire is 18% contained. It has burned nearly 37,000 acres in almost a week.
• The Airport Fire started in an Orange County canyon and crossed into Riverside County. Eight firefighters were injured.
• A 34-year-old Norco man was arrested on suspicion of starting the Line Fire.
• A major cooldown is underway across the region after a week of scorching triple-digit heat. But meteorologists say the fire danger remains elevated in some areas due to persistent dry conditions.
• Smoke from the fires on the bridge, power line and airport will continue to impact air quality in parts of the region, including the desert.