Figure 6.
Time-series data of VOC concentration and log10 HF (subject D). Subjective symptoms and personal activities are indicated in upper side and locations are indicated in lower side. The values on subjective symptoms are symptom levels.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.