Grass fire and chemical warfare attack

I have invented the handy-dandy grass fire survival system.  It consists of a filter cloth, standard foxhole shovel, smoke filter and tiny oxygen container.

Upon seeing the fire, you are in smoke, and it's coming right at you.  Immediately stomp the grass around you, and spread out the weighted cloth, because the severe convection storm is 100 km/hr.  My cloth is a big donut, with a hole.  Put on the smoke filter, and dig like your life depends on it.  Cover the cloth and go to recommended volume of half a person.

Jump in and pull the cloth over you with all the dirt. You now have another filter.  You have to survive the ten minutes where there is no oxygen.  The automatic face filter starts bleeding the oxygen so you survive face down in the dirt.  The cloth is a carbon heat shield.

When the oxygen is back. put out the little pointy stick that tells the temperature, like a roast thermometer.  Jump out and say "Wooo boy!'.

I am selling these for 10,000 a pop.  Tested in my brain.  Also good for when you see a Russian sprayer drone.

ps of course, if the weather people ever use physics, you won't need it.