Variable | Definition | Unit | Source |
C | Formaldehyde concentration in air | µg∙m−3 | TWA8; STEL from sampling |
ET | Exposure time | hour day−1 | 8 (normal working hour) |
EF | Exposure frequency | days year−1 | 225 (5 days week−1 for 45 weeks year−1) |
ED | Exposure duration | years | 30 [28] |
AT | Averaging time | days | ED × 365 days year−1 (noncancer); 70 years × 365 days year−1 (cancer) |
RfC | Inhalation reference concentration | µg∙m−3 | 3.94 × 10−5 [32] |
IUR | Inhalation unit risk | (µg∙m−3)−1 | 1.3 × 10−5 [34] |