Philippine issues health warning as volcano brings smog to capital, nearby provinces

The state volcanology and seismology institute said it observed upwelling of hot volcanic fluids in the Taal volcano's crater lake, resulting in the emission of volcanic gases.

The alert remained at level 1 on a five-level scale, denoting a "slight increase in volcanic earthquake, and steam or gas activity".

Located in a scenic lake in Batangas province near Manila, the 311-metre (1,020-foot) Taal is among the most active of 24 volcanoes in the Philippines.

In January 2020, it spewed a column of ash and steam as high as 15 km (9.32 miles), forcing more than 100,000 people to evacuate and dozens of flight cancelations as heavy ash fell as far away as Manila.

"We have reports of respiratory illnesses in Batangas province due to intoxication from the volcanic smog," Randy Dela Paz, operations section chief at the civil defense's southern Manila office, told DWPM radio.

Volcanic smog, or vog, consists of fine droplets containing volcanic gas like sulfur that can cause irritation of the eyes, throat and respiratory tract.

Authorities suspended Friday classes in dozens of towns and cities Cavite, Laguna, and Batangas provinces adjacent to Taal volcano, and in five cities in the capital region.

The aviation authority on Friday told pilots to avoid flying close to the volcano's summit "as airborne ash and ballistic fragments from sudden explosions may pose hazards to aircrafts".

The Philippines is in the Pacific "Ring of Fire," where volcanic activity and earthquakes are common.