Go-Bags.
As mentioned earlier on this thread, disaster-preparations officials advise citizens and residents who might be affected to have a go-bag prepared, to be used in any evacuations and/or traveling outdoors in a volcano-produced emergency.
This is a backpack containing a radio with good batteries ... non-perishable foods such as nuts and dried fruits ... water ... a flashlight ... a "95" rated dust mask ... any medicines you need to take ... a scarf and a triangular cloth to protect mouth and nose against ash.
If you can recall old Wild West movies and TV shows, you have an idea about this cloth from what the bandidos were wearing across their lower face during the stagecoach robbery.
The cloth should be moistened before wearing.
A cell phone might be a good addition, too.
cccmedia in Quito