****Overview
Instrument: PTR-TOF data
Data: time series of VOC concentrations and air change rates
Campaign ID: H1b 
Campaign descrption: month-long observation campaign at House 1, in California, US during 2017 winter (H1b)
Created by: Yingjun Liu
Contact info: yingjun.liu@pku.edu.cn

****Air change rate data
File Name: ID_ACR.csv (ID ="H1b")
Column name： start time, whole-house air change rate (h-1)
Time resolution:2 hour
TimeData format: second since 1900-01-01


****VOC concnetration data
File Name: ID_VOCs_XXX.csv (XXX = Attic, Basement, Bedroom, Crawlsapce, Kitchen, or Outdoor)
Column Name: listed in File "ID_VOCs_ColumnName.csv", including start time and concentrations of selected organic ions (ppb). 
Time resolution: 5 mins (sampling for 5 mins at each location, the last three mintues data is averaged and reported)
TimeData format: second since 1900-01-01
VOC signal selection criteria: see details in Liu et al., 2019 Indoor Air. In total, 661 mass peaks were detected in the summer campaign. The mass peaks were first filtered to remove background ions predominantly arising from the instrument and from tubing.  A best-guess ion formula was then assigned to each of the remaining peaks, utilizing the accurate mass determinations and the correlation of their signals with other peaks.  The list of ion formulas was further reduced by combining isotopic ions and identified fragment ions, removing interference ions, tracer ions, sticky ions, and inorganic ions, and applying an abundance threshold. The inclusion criterion based on abundance was an average mixing ratio in the kitchen air greater than 0.005 ppb and above the respective detection limit.  From the 661 ion peaks detected by PTR-ToF-MS across the summer campaign, 171 VOC signals (organic ion formulas) were extracted to represent measured VOC speciation.