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Figure 1: a. General outside view of the GRIMM EDM 365 Environmental dust monitor fixed near King Khalid International Airport in Riyadh. b. Open view of the GRIMM EDM 365 Environmental dust monitor.

Figure 1: a. General outside view of the GRIMM EDM 365 Environmental dust monitor fixed near King Khalid International Airport in Riyadh. b. Open view of the GRIMM EDM 365 Environmental dust monitor.