Likens-Bormann 1972 Hubbard-Brook: SO2 + 1/2 O2 + H2O -> H2SO4; NO2 + OH -> HNO3; pH 4-4.5 in rain since industrial-revolution; Clean Air Act 1990 amendments reduced US emissions 80%.
Likens-Bormann 1972 Hubbard-Brook: SO2 + 1/2 O2 + H2O -> H2SO4; NO2 + OH -> HNO3; pH 4-4.5 in rain since industrial-revolution; Clean Air Act 1990 amendments reduced US emissions 80%.