Northern California’s now infamous Camp Fire was not only the largest, longest, and deadliest wildfire in the state’s history, it also produced record amounts of smoke. Schools closed, there was a run on protective masks, and people were fashioning do-it-yourself air purifiers because there were none left in stores. And it looks like we will only see an acceleration of wildfires in the future. This grim forecast has brought a surge in traffic to websites that monitor air quality like AirNow, Weather Underground, and PurpleAir. This week on Sea Change Radio, we speak with the founder and CEO of PurpleAir, a company that sells laser air quality sensors for home use at a reasonable price, and posts all the results in real-time on its site. We discuss PurpleAir’s business model, its unique brand of crowd-sourcing technology, and examine the ways that it casts the world in a different, and sometimes frightening, light.