L.A. meets Yosemite as smog is moving from being an urban issue to one that's killing plant life and causing rangers to caution visitors headed into the mountains for a hike.
Imagine cruising through rural California on your way to your family’s favorite vacation spot in Joshua Tree or Sequoia National Park. After hours of driving you stretch, lace up your hiking shoes and then see a sign declaring it unsafe to hike on that particular day.
Wildfires? A mountain lion? Has some species of endangered animal decided to nest at the trailhead?
No, no and not even close.