Table 4.
Indoor-to-outdoor ratios (I/O) for CO, formaldehyde, and nicotine in the waterpipe cafés of Tehran.
| Café type | I/O Ratio | ||
|---|---|---|---|
| CO | Formaldehyde | nicotine | |
| HS | 5.75 | 34.7 | NC* |
| CS | 6.03 | 20.7 | NC |
| HCS | 10.1 | 156 | NC |
| NS | NC | NC | NC |
*Not-calculable.
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