GEO deployed two dust monitors at this construction site in Miami, Florida. Why two? The contractor is responsible for controlling dust from the site, but there may be other sources of dust that are outside the contractor's control.
By deploying two monitors, one upwind and one downwind from site activities, it is possible to calculate "site contribution" and to relieve the contractor from responsibility for dust originating off site.
The solar-powered monitors send their measurements offsite for processing and reporting. Results are displayed graphically on a web page.
An upwind dust monitor, positioned outside the perimeter fence monitors dust blowing onto the site.
A downwind monitor, positioned on the other side of the site, monitors total dust blowing across the site.