The IMPROVE sampler consists of four sampling modules operated by a single controller. Many are housed in open-air stands, such as the unit shown in the photo below, at Capitol Reef National Park, Utah. Others are housed in enclosed shelters.
The Site Operators SOP #201 contains operating procedures and a troubleshooting guide for the IMPROVE Sampler. This SOP also includes photos and diagrams of the sampler and of the sampler cassettes.