With the various volcanoes venting and seemingly more than some years nearer to the equator, thought it might be a good time to glance at SO2 in the atmosphere.
First a look from NASA at the different sources of SO2. This gas that can cool the atmosphere for a few years after major eruptions not only comes from volcanoes, but from human endeavors such as oil and gas exploration, power plants and smelting.
Looking at the GEOS-5 Chem model, specifically SO2 Col Mass the various sources can be seen belching varied amounts. Fuego and Kilauea can easily be spotted in the GEOS forecast. Both their plumes are headed in a generally west direction as is other volcanoes in the equatorial region from the Caribbean through Central Pacific. The western edge of the Ring of Fire has the SO2 being swept north and south toward the poles and back eastward. Some additional close up graphics of Kilauea SO2 plume from NOAA can be found here.
According to the Guam Weather Office Vog from Kilauea has already affected the Marshell Islands and is expected to impact Kosrae, Pohnpei and possibly Chuuk in the Federated States of Micronesia this week.
Volcanoes Behaving Badly