Table 2.
Long-term means and trends in satellite-derived population-weighted ground-level mean NO2 compared with long-term means and trends in satellite-derived population-weighted PM2.5 from van Donkelaar et al. (2014).
| Region | Mean NO2 (2001–2010) (parts per billion) | 1998–2012 trend for NO2 (percent/year) (95% CI) | 2001–2010 PM2.5 (μg/m3)(ranking)a | 1998–2012 trend for PM2.5 (percent/year) (95% CI)a |
|---|---|---|---|---|
| Asia Pacific (high-income) | 4.7 | –2.1 (–2.9, –1.3) | 16.8 (7) | –0.4 (–1.2, 0.4) |
| Western Europe | 3.9 | –2.3 (–2.9, –1.8) | 13.5 (8) | –1.9 (–2.8, –1.0) |
| North America (high-income) | 3.5 | –5.3 (–6.0, –4.6) | 9.9 (12) | –3.3 (–4.1, –2.5) |
| East Asia | 3.3 | 6.5 (5.8, 7.3) | 50.3 (1) | 3.2 (2.1, 4.3) |
| Eastern Europe | 2.3 | 1.8 (–0.1, 3.6) | 12.6 (9) | –0.3 (–2.0, 1.4) |
| Central Europe | 2.0 | –0.8 (–1.6, –0.1) | 17.8 (5) | –1.2 (–2.7, 0.3) |
| Southern Latin America | 1.3 | –0.6 (–2.3, 1.1) | 6.4 (17) | 1.3 (–0.1, 2.7) |
| Central Latin America | 1.0 | –2.2 (–3.3, –1.1) | 8.5 (14) | –0.8 (–1.6, 0) |
| Australasia | 0.9 | –1.6 (–2.6, –0.6) | 3.0 (20) | 0.3 (–0.7, 1.3) |
| Southern sub-Saharan Africa | 0.9 | –1.6 (–2.3, –0.9) | 5.9 (18) | 1.5 (0.1, 2.9) |
| North Africa/Middle East | 0.8 | 2.5 (1.7, 3.2) | 25.5 (4) | 1.5 (0.7, 2.3) |
| Tropical Latin America | 0.6 | –3.0 (–4.3, –1.7) | 5.0 (19) | 0.2 (–0.6, 1.0) |
| Central Asia | 0.6 | 0.5 (–0.6, 1.7) | 17.3 (6) | 1.7 (0.7, 2.7) |
| Andean Latin America | 0.6 | –0.0 (–2.1, 2.0) | 6.6 (16) | 1.4 (–0.7, 3.5) |
| South Asia | 0.5 | 1.7 (0.7, 2.7) | 34.6 (2) | 2.9 (2.2, 3.6) |
| Southeast Asia | 0.5 | –0.1 (–1.0, 0.8) | 11.0 (11) | 2.7 (1.9, 3.5) |
| Caribbean | 0.2 | –0.8 (–2.2, 0.6) | 7.0 (15) | –0.3 (–1.3, 0.7) |
| West sub-Saharan Africa | 0.2 | –0.4 (–1.5, 0.7) | 30.8 (3) | –0.1 (–1.0, 0.8) |
| Central sub-Saharan Africa | 0.1 | –1.7 (–2.7, –0.8) | 11.4 (10) | –0.4 (–1.2, 0.4) |
| East sub-Saharan Africa | 0.1 | –0.3 (–2.1, 1.4) | 9.8 (13) | 1.0 (0.1, 1.9) |
| Oceania | < 0.1 | –0.4 (–2.1, 1.4) | 2.3 (21) | 3.9 (2.6, 5.2) |
| Global | 1.7 | 1.0 (0.74, 1.3) | 26.4 | 2.1 (1.6, 2.6) |
| Numbers in parentheses for mean PM2.5 give regional ranking. aFrom van Donkelaar et al. (2014). | ||||