Nighttime footage from a permanent camera set up near the volcano showed it was belching out incandescent rocks and smoke. The National Center for Disaster Prevention has registered 68 exhalations of gas vapor and ash of medium intensity coming from the volcano in the last 24 hours.
The volcano can also bee seen spewing ash in daytime footage.
The volcanic mountain sits roughly halfway between Mexico City and Puebla with some 25 million people living within a 60-mile radius.
Popo, as it is commonly known, has erupted small amounts of ash almost daily since activity began in 1994.
Officials have not ordered any evacuations.
ABC News contributed to this report.
