Taal volcano (Luzon Island, Philippines): volcanic smog (vog) in Taal caldera

Thu, 1 Jul 2021, 05:01
05:01 AM | BY: MARTIN
Elevated SO2 emissions causing air pollution in Manila region over the last days (image: @simoncarn/twitter)
Elevated SO2 emissions causing air pollution in Manila region over the last days (image: @simoncarn/twitter)
Strong sulfur dioxide (SO2) emissions, detected on 28 June, caused volcanic smog (so-called vog) in Taal caldera.
Vog is a hazy mixture of SO2 gas and aerosols (tiny particles or droplets) which are primarily sulfuric acid and other sulfate (SO4) compounds. Aerosols are created when SO2 and other volcanic gases combine in the atmosphere and interact chemically with oxygen, moisture, dust, and sunlight over minutes to days. The exact composition of vog depends on how much time the volcanic plume has had to react in the atmosphere. In areas far (tens to hundreds of km or miles) from active vents, aerosols are the main component of vog. Closer to the volcano, vog contains both aerosols and unreacted SO2 gas.
In addition, satellite-based measurements of increased Taal's SO2 concentrations in the atmosphere are causing air pollution in Manila region.
Elevated sulfur dioxide (SO2) emissions from 28 June exceeded almost 5 times SO2 average levels (3000 tonnes/day) over the past two months.
Sulfur dioxide (SO2) emissions reached to a 6685 tonnes/day today and continue at above-average levels.
Source: Phillippine Institute of Volcanology and Seismology volcano activity update 30 June 2021
Source: USGS/Frequently Asked Questions About Volcanic Smog (Vog)

Previous news

Tue, 29 Jun 2021, 06:41
Degassing activity of Taal volcano is associated with strong SO2 emissions as visible from satellite (image: Sentinel 2)
The degassing activity of the volcano continues at elevated levels as strong and intense sulfur dioxide (SO2) emissions reached to a 14326 tonnes/day! yesterday. ... Read all
Show more
Try our free app!
Volcanoes & Earthquakes - new app for Android
Android | iOS version

More on VolcanoDiscovery

Why is there advertising on this site?
Support us - Help us upgrade our services!
We truly love working to bring you the latest volcano and earthquake data from around the world. Maintaining our website and our free apps does require, however, considerable time and resources.
We need financing to increase hard- and software capacity as well as support our editor team. We're aiming to achieve uninterrupted service wherever an earthquake or volcano eruption unfolds, and your donations can make it happen! Every donation will be highly appreciated. If you find the information useful and would like to support our team in integrating further features, write great content, and in upgrading our soft- and hardware, please make a donation (PayPal or Online credit card payment).

Planned features:
  • Weather reports
  • Tsunami alerts
  • Design upgrades
  • Faster responsiveness
Thanks to your past donations, these features have been added recently:
  • Earthquake archive from 1900 onwards
  • Additional seismic data sources
  • Improved content in English
Download and Upgrade the Volcanoes & Earthquakes app to get one of the fastest seismic and volcano alerts online:
Android | IOS
Thank you!
Copyrights: VolcanoDiscovery and other sources as noted.
Use of material: Most texts and images, in particular photographs, on this website are protected by copyright. Further reproduction and use of without authorization is usually not consented. If you are not sure or need licensing rights for photographs, for example for publications and commercial use, please contact us.