Elwood sampled for two weeks in Azusa, from a "Meat truck" (an air conditioned lab-on-wheels) which belongs to the South Coast Air Quality Management District. This picture shows the delicate transfer of the instrument from the moving truck into the meat truck.
 
 

Once the instrument was placed in the meat truck and working, a shade providing tent was set up for the comfort of the operators, who had to spend twelve-hour shifts at the site.
 
 

In this picture you see Elwood sampling ambient particles at the Azusa site.