Calculating air pollution from wildfires and other events has become more complicated. That doesn’t mean it’s necessarily more accurate.

Los Angeles is now a week removed from the day that multiple devastating wildfires erupted to torch tens of thousands of acres. But still, the question remains if people should wear masks to limit their exposure to toxins in the air.

Smoke from several wildfires in metro Los Angeles negatively affects the air quality of a population of about 18 million people. Air quality in Los Angeles was at "moderate" levels on Thursday morning,