Kīlauea acid rain

Rapid oxidation of the SO2 forms acidic sulphate aerosol known locally as 'vog'. Rain falling through this vog can be quite acidic. Samples collected between 1987 and 1991 in Hilo ranged between pH 4.1 and 5.4, with an average value of 4.5 (n=66).

See Also:
Volcanic Ash & Gases > Acid Rain