Table 1 Average absolute and per cent trends in sulfate in aerosols.
Time period | Region | Nr. of stations | Average annual trend (STD) %/year | Absolute annual trend (STD) μgS/m3 year | ||
|---|---|---|---|---|---|---|
Obs | Ensemble | Obs | Ensemble | |||
1980–1990 | Europe | 16 | −2.56 (3.10) | −0.048 (0.094) | ||
1990–2000 | Europe | 41 | −5.16 (2.11) | −5.23 (1.17) | −0.073 (0.052) | −0.070 (0.051) |
1990–2000 | North America | 101 | −2.08 (1.44) | −1.94 (0.43) | −0.024 (0.025) | −0.021 (0.014) |
1990–2015 | Europe | 33 | −2.93 (0.69) | −3.10 (0.48) | −0.031 (0.015) | −0.036 (0.023) |
1990–2015 | North America | 124 | −2.14 (0.67) | −2.19 (0.29) | −0.026 (0.024) | −0.024 (0.018) |
2000–2010 | East Asia | 13 | 0.44 (4.25) | 0.42 (1.15) | 0.003 (0.034) | 0.006 (0.013) |
2000–2010 | Europe | 43 | −2.86 (2.20) | −3.53 (1.06) | −0.029 (0.041) | −0.027 (0.017) |
2000–2010 | North America | 227 | −3.03 (1.72) | −3.22 (0.77) | −0.029 (0.029) | −0.027 (0.020) |
2000–2015 | East Asia | 13 | 2.68 (9.41) | 0.02 (0.91) | 0.003 (0.037) | 0.001(0.009) |
2000–2015 | Europe | 36 | −2.67 (2.03) | −3.26 (0.85) | −0.025 (0.028) | −0.025 (0.015) |
2000–2015 | North America | 218 | −3.15 (1.30) | −3.18 (0.66) | −0.028 (0.029) | −0.024 (0.019) |
