The graphs on this page represent a comparison of the 24 hour particulate concentrations measured with continuous instruments (FDMS) used for near real-time data reporting against daily (24 hour) values measured with Federal Reference Method (FRM) filter based samplers. The real-time data values represent the best estimate of what the FRM values will be based on historic data. FRM sample values are generally available about 1 month after the sampling date.

Viking Lake PM 2.5 - Cold Weather FDMS v FRM (October-April 2008-09)

Equation: y=1.102x , R(squared)=0.832
Units measured in µg/m³ - Micrograms per Cubic Meter of Air

Viking Lake PM 2.5 - Warm Weather FDMS v FRM (May-September 2008)

Equation: y=1.273x , R(squared)=0.844
Units measured in µg/m³ - Micrograms per Cubic Meter of Air

Viking Lake PM 2.5 - Cold Weather FDMS v FRM (October-April 2007-08)

Equation: y=1.025x , R(squared)=0.776
Units measured in µg/m³ - Micrograms per Cubic Meter of Air

Viking Lake PM 2.5 - Warm Weather FDMS v FRM (May-September 2007)

Equation: y=1.0722x , R(squared)=0.8717
Units measured in µg/m³ - Micrograms per Cubic Meter of Air

Viking Lake PM 2.5 - Cold Weather FDMS v FRM (October-April 2006-07)

Equation: y=1.0302x , R(squared)=0.7781
Units measured in µg/m³ - Micrograms per Cubic Meter of Air

Viking Lake PM 2.5 - Warm Weather FDMS v FRM (May-September 2006)

Equation: y=1.0635x , R(squared)=0.9342
Units measured in µg/m³ - Micrograms per Cubic Meter of Air

Viking Lake PM 2.5 - Cold Weather FDMS v FRM (October-April 2005-06)

Equation: y=0.8956x , R(squared)=0.6828
Units measured in µg/m³ - Micrograms per Cubic Meter of Air

Viking Lake PM 2.5 - Warm Weather FDMS v FRM (May-September 2005)

Equation: y=0.9091x , R(squared)=0.9577
Units measured in µg/m³ - Micrograms per Cubic Meter of Air