I live south of Portland where air quality has been varying between 350 (Hazardous) and 777 (the scale only goes to 500). As I type this, AQI is 548. I'm part of my neighborhood fire watch and while doing rounds last night, the Biohazard mode was incredibly useful. I would have had to wear an N95 in my MX without it. Also, at times the smoke and fog was so thick in certain areas that I couldn't see the road unless I looked out my side window down at the yellow line. But setting the map display to max zoom, I could navigate through the dense patches of smoke, essentially flying by instruments. There was no other way to tell where to turn.
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