Taal volcano (Luzon Island, Philippines): volcanic smog (vog) in Taal caldera
Thu, 1 Jul 2021, 05:0105:01 AM | BY: MARTIN
Strong sulfur dioxide (SO2) emissions, detected on 28 June, caused volcanic smog (so-called vog) in Taal caldera.
Elevated SO2 emissions causing air pollution in Manila region over the last days (image: @simoncarn/twitter)
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)
Tue, 29 Jun 2021, 06:41
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