SEVERAL local government units in Luzon suspended classes on Friday due to the thick volcanic smog from Taal Volcano.

The Philippine Institute of Volcanology and Seismology said vog is particularly harmful to individuals with asthma, lung disease, heart disease, the elderly, pregnant women, and children.

Volcanic sulfur dioxide emission from the main crater has reached 4,569 tons per day. A large cloud of sulfur dioxide was also detected over the west of Taal Lake, the Phivolcs said.

Below are the class suspensions:

Batangas province

• Alitagtag: all levels, public and private
• Balayan: all levels, public and private
• Calatagan: all levels, public and private
• Lian: all levels, public and private
• Lemery: all levels, public and private
• Nasugbu: all levels, public and private
• Mataasnakahoy: all levels, public and private
• San Luis: all levels, public and private
• Sta. Teresita: all levels, public and private
• Taal: all levels, public and private
• Tanauan: all levels, public and private
• Tuy: elementary, junior and senior high school, public and private

Cavite province

• Alfonso: all levels, public and private
• Amadeo: all levels, public and private
• Bacoor City: all levels, public and private
• Cavite City: all levels, public and private
• City of Carmona: all levels, public and private
• Dasmariñas City: all levels, public and private
• GEA (Bailen): all levels, public and private
• GMA: all levels, public and private
• Gen. Trias City: all levels, public and private
• Imus City: all levels, public and private
• Indang: all levels, public and private
• Kawit: all levels, public and private
• Magallanes: all levels, public and private
• Maragondon: all levels, public and private
• Mendez: all levels, public and private
• Naic: all levels, public and private
• Noveleta: all levels, public and private
• Rosario: all levels, public and private
• Silang: all levels, public and private
• Tagaytay City: all levels, public and private
• Tanza: all levels, public and private
• Ternate: all levels, public and private
• Trece Martires City: all levels, public and private

Laguna

• Biñan: all levels, public and private
• Cabuyao: all levels, public and private
• Los Baños: all levels, public and private
• San Pedro: all levels, public and private

Metro Manila

• Las Piñas: all levels, public and private
• Muntinlupa City: all levels, public and private
• Parañaque: all levels, public and private
• Pasay City: all levels, public and private
• San Juan City: all levels, public and private
• Caloocan City: all levels, public and private (afternoon classes).