Description of the Air Quality Monitoring System

The RM-60 Micro-Roentgen radiation monitor Aware Electronics has been set up in a private residence to provide real-time background radiation levels. The monitoring results are linked with the current meteorological data analysis to provide an estimate of the potential source region of the monitoring data. The RM-60 is located on the south side of the building, adjacent, but inside, with GM tube's mica opening perpendicular to a single pane window. Indoor background levels are normal and therefore only gamma (and perhaps beta) radiation is expected to be detected from outside sources. The RM-60 unit uses linux code to monitor the serial port, saving the count every 2 minutes averaged over 5 minute intervals. Display units are micro-R per hour divided into six hour periods, which defines the sampling window for the graphic display. The end time of the sampling window corresponds to the times of the upwind source analysis.

To put the RM-60 readings in perspective some units conversion is in order:
1 Sv (Sievert) = 100 R = 0.05 cancer risk (according to ICRP)
1 micro-Sv = 100 micro-R (display units)
1 Sv = 1.0E+08 micro-R
2.0E-05 Sv = 1.0E-06 cancer risk (one in a million)
2000 micro-R = 1.0E-06 cancer risk
100000 micro-R = maximum range of RM-60


Description of the Air Quality Monitoring System

The PurpleAir PA-II is located 2 m from the west side of the building about 1 m above ground. The PA-II uses a laser particle counter (PMS5003, PMS1003) to provide real-time measurements of PM1.0, PM2.5 and PM10. These sensors count suspended particles in sizes of 0.3, 0.5, 1.0, 2.5, 5.0, and 10um and then use an algorithm to estimate the PM concentrations in ug/m3. The PurpleAir web site contains more detailed technical information about the sampler as well as links to map showing nearby locations deploying PurpleAir sensors.


Description of the Weather Monitoring System

The Davis Vantage Vue, located about 5 m from the west side of the building on a 2 m pole over a grassy area, measures rain, wind, temperature, and humidity in a self-contained sensor suite. The sensors and transmitter are solar-powered with a battery backup. A passive radiation shield provides for more accurate temperature and humidity readings. The weather data updates every 2.5 seconds wirelessly to the WeatherLink Live receiver, which also contains a barometer, and inside temperature and humidity sensors. The data then uploads to WeatherLink.com, Weather Underground, and the CWOP network via Wi-Fi. More information about the Vantage View is available from the Davis web site.