The warning level for the Popocatépetl volcano in Mexico was raised on Sunday. The new warning level is only one step away from the red alert level, in which the population is supposed to be ready for evacuation.

This Monday, evacuation routes and the designation of emergency shelters are to be reviewed. About 100 million people live within a radius of 25 kilometers of the volcano. It is located 85 kilometers southeast of the capital Mexico City. In the past few days, it has repeatedly emitted ash, steam and gas.