after learning that the Chimney Fire ( San Luis Obispo County, California ) was started by a car pulling off the road, and igniting the dry grass, there's been an effort to prevent that fire from re-occuring, by using a long-term fire retardant.

The 25-day fire burned 46,343 acres and destroyed 49 homes and 21 other structures. At its peak, close to 4,000 firefighters battled the blaze with resources that included 310 fire engines, 66 water tenders, 14 helicopters, four air tankers, 109 hand crews and 45 bulldozers.

“That’s what the Fortify product can do is adhere or coat the vegetation. It helps to render it nonflammable,” said Wes Bolsen, Perimeter Solutions Global Wildfire Prevention and Protection Business Director. 

 Phos-Chek Fortify, a new fire prevention tool, is now being used up and down California.

The Fortify product basically adheres to or coats the vegetation, rendering it non-flammable. Bolsen says the vegetation chars and then if there were heat coming in, it actually releases H20. “It’s designed to spray alongside the road to keep fires from occurring, to stop ignitions and then if they do get ignition, reduce the spread to buy time to get the fire engines to arrive and put the fire out,” said Turner.

 https://gooddaysacramento.cbslocal.com/2021/06/09/fire-prevention-tool-californians-safe/

https://santamariatimes.com/news/local/wildfire/investigators-identify-cause-of-last-summers-chimney-fire/article_71cb80f4-e042-55b1-97ca-da3237da74e8.html

I learned about this from the actor Jeremy Renner  https://armchairexpertpod.com/pods/jeremy-renner