Winddirection dependent sampling to support source apportionment

The Genius5 Windselect includes an interface, where an ultrasonic windsensor is connected. The Windsensor measures Windspeed and Wind direction and transfes the results to the Genius5 controller once a second. The software defines 2 Windsectors for sampling and a threshold velocity The controller samples to 1 cartridges dependent on Wind speed (e.g. below 1 m/s) and 2 different cartridges dependent on the set Windsectors in relation to the wind direction

After the measurement periode, the cartridges are sent to the laboratory together with the USB memorystick, where the cartridges are analysed for pollutants.

Potential for reduction of fine dust, metals, carcinogenics

Hot spot sites near a streat or a point source and Background sites show different concentrations of dust. Regular 24 hours measurements don´t provide informations of local traffic impact or point ource impact to the resut. Genius5 Windselect samples fine dust to different cartridges, dependent if the wind comes from the Background area or directly from a Point source/traffic. During clam condition the Genius5 samples to a 3rd cartridge, while wind speed is below the set calm limit.

the Windselect data give valueable information, about adverse dispersion effects or low level point sources and the potential for PM10 reduction in µg/m3, if the emissions of the point source/street are reduced.

More parameters for Positive Matrix Factorization

Besides the PM10 levels, other parameters provide additional informations, to separate the influence of several point sources:

  1. All cartrides sample the fraction greater than 10µm with a 50% cutpoint, providing information about pollutant deposition
  2. Cartridge FU_10 is designed to sample PM10 in combination with POP´s (persitstant organic pollutants), or other carcinogenics like PAH´s, oxidised PAH, Nitro PAH
  3. Cartridge FU_20 is designed to sample PM10 in combination with metals, gaseous mercury
  4. Cartridge FU_30 samples PM10, PM2.5, as well as POP´s and carcinogenic pollutants

Additional parameters may be used to calculate the impact of many different sources using Chemometric methods or Positive Matrix Factorization