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Mean concentrations of PM2.5 and black carbon, together with the percentage contribution of BC, in the six Brazilian cities studied
| PM2.5 (μg m−3) | BC (μg m−3) | %BC | ||
|---|---|---|---|---|
| City | N | Mean (SD) | Mean (SD) | Mean (SD) |
| São Paulo | 340 | 28.1 (13.6) | 10.6 (6.4) | 38 (14) |
| Rio | 427 | 17.2 (11.2) | 3.4 (2.5) | 20 (7) |
| Belo Horizonte | 371 | 14.7 (7.7) | 4.5 (3.3) | 31 (13) |
| Curitiba | 320 | 14.4 (9.5) | 4.4 (4.0) | 30 (11) |
| Porto Alegre | 342 | 13.4 (9.9) | 3.9 (4.3) | 26 (11) |
| Recife | 327 | 7.3 (3.1) | 1.9 (1.1) | 26 (12) |
N total number of samples
