Hawaii Volcanic Gases and Ash - 10 of 9

Hawaii Volcanic Gases and Ash FAQs - 9 Found

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Where and how do SO2 and volcanic gases (vog) affect air quality in Hawai`i?

The most critical factors that determine how much vog impacts an area are wind direction and speed. Air temperature, humidity, rainfall, location of the source, and the amount of SObeing emitted are also factors.

During prevailing trade (from northeast) wind conditions, any SO2 emitted from Pu`u `Ō `ō is blown out to sea, while any SO2 from the summit vent often creates vog in Ka`u communities from Pahala to Ocean View. Unfortunately, both plumes eventually reach the west side of Hawai`i Island in a "double-whammy" of combined effects, resulting in an especially dense and nearly constant haze of vog along the Kona coast.       During prevailing northeasterly tradewinds, emissions from Kīlauea are blown to the leeward side of the island, creating a chronic pollution problem along the Kona coast.  During wind reversals, shown by the red arrows, emissions are blown to the east side of the island impacting windward population centers.                                                                                                                                 


When the winds become light and variable or blow from the south, communities in East Hawai`i and along the entire Hawaiian Island chain can also suffer the effects of vog. Under these conditions, people living in the path of Pu`u `Ō `ō gas emissions continue to experience vog levels similar to those that have beset them for over two decades. Communities in the path of summit SO2 emissions, particularly those nearest the source vent, can be subjected to an unusually acrid haze that contains both gas and acidic particles because the emissions have had little time to disperse and dilute before reaching them. 

Learn more: 

Hawaii Interagency Vog Information

Volcanic Air Pollution Hazards in Hawaii (USGS Fact Sheet)

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