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Indoor/outdoor ratios for PM and PNC in winter, spring, and summer.
| Season | I/O | PM1.0 | PM2.5 | PM4.0 | PM10 | PNC0.3 | PNC0.5 | PNC1.0 | PNC2.5 | |
|---|---|---|---|---|---|---|---|---|---|---|
| Winter | P1/P2 | a.m | 1.3 | 1.7 | 2.3 | 3.2 | 1.3 | 1.8 | 2.8 | 3.2 |
| p.m | 0.9 | 1.4 | 2.5 | 3.1 | 0.8 | 1.2 | 2.4 | 2.5 | ||
| Spring | P1/P2 | a.m | 1.9 | 3.7 | 5.3 | 6.1 | 1.7 | 3.6 | 5.5 | 5.3 |
| p.m | 1.3 | 2.1 | 3.0 | 3.2 | 1.3 | 2.3 | 3.1 | 3.1 | ||
| Summer | P1/P2 | a.m | 1.6 | 3.8 | 6.5 | 10.5 | – | – | – | – |
| p.m | 1.7 | 3.9 | 5.9 | 8.8 | – | – | – | – | ||
– not measured.
