"Figure 14: Acid rain precursor emissions: by type of gas, 1990–2011","" "United Kingdom resident basis","" "","" "Notes","" "Unit","Thousand tonnes of sulphur dioxide equivalent" "","" "","Sulphur Dioxide SO2","Nitrogen Oxide NOX","Ammonia NH3" "1990","3983.87","2261.47","664.43" "1995","2594.41","1864.07","631.69" "2000","1439.77","1496.94","605.71" "2001","1399.57","1539.23","602.34" "2002","1298.74","1507.88","588.49" "2003","1305.65","1523.13","569.74" "2004","1206.39","1528.56","579.14" "2005","1071.54","1514.73","569.85" "2006","897.92","1347.79","568.38" "2007","840.63","1319.60","548.19" "2008","724.62","1231.90","523.15" "2009","575.61","1062.94","526.42" "2010","577.00","1051.10","535.70" "2011","528.95","1027.98","544.08"