Table 3 Micro-environment percent contribution to TAA-PNC annual average by employment status.
From: Effect of time-activity adjustment on exposure assessment for traffic-related ultrafine particles
Micro-environment | Average time (hours) | % Time (hours/24 hours) | Annual average PNC (#/cm3) | %Exposure a |
|---|---|---|---|---|
Residential | 17.14 | 75.3 | 24,000 | 78.36 |
Work | 3.95 | 16.5 | 18,000 | 13.54 |
Other | 1.56 | 6.5 | 17,000 | 5.05 |
Highway | 0.4 | 1.7 | 40,000 | 3.05 |
Working full or part time | ||||
Residential | 14.47 | 60.3 | 24,000 | 64.74 |
Work | 7.55 | 31.5 | 18,000 | 25.33 |
Other | 1.09 | 4.5 | 17,000 | 3.45 |
Highway | 0.89 | 3.7 | 39,000 | 6.47 |
Non-working, retired or disabled | ||||
Residential | 20.28 | 84.5 | 25,000 | 86.54 |
Work | 0.84 | 3.5 | 17,000 | 2.44 |
Other | 2.23 | 9.3 | 17,000 | 6.47 |
Highway | 0.65 | 2.7 | 41,000 | 4.55 |
