Air Quality Read Me File

Values are 10-minute data, downloaded from the PurpleAir API and made available in csv format. All Purple air locations have 2 channels, A and B. If the channels are functioning properly, they should record nearly identical data values.

No quality controls were performed. As such, there are times with no data. There are also times with unreasonably high values or zero values for one or both channels. Zero values may or may not be correct. Care should be taken when selecting data.

---Data Key---

date_time:      year-mn-dy hr:mn:ss (times are UTC)

pm2.5_atm_a:    channel A, PM  2.5, hourly or 10-minute average value (microgram/m3)
pm2.5_atm_b:    channel B, PM  2.5, hourly or 10-minute average value (microgram/m3)
pm10_atm_a:     channel A, PM  10, hourly or 10-minute average value (microgram/m3)
pm10_atm_b:     channel B, PM  10, hourly or 10-minute average value (microgram/m3)