Plot Speciation Data

NOTICE (posted August 22, 2008) - The speciation data provided on this page have been updated to include all data through 2007. All the data are based on the "reported sample values" instead of the "standard sample values" in AQS. The "standard sample values" employ 1/2 mdl substitution for values below mdl; "reported sample values" do not. The exact methodology is documented on page 4-266 of the AQS Data Dictionary.

This tool plots PM2.5 speciation data as described in the About the Data page. The SANDWICH-adjusted data that are available on the Query Speciation Data page are not yet linked to this tool.

Step 1: Select a County or MSA
County:
MSA:


Step 2: Select Dates
From
To

Step 3: Submit Selections

Plot Speciation Data

Local Navigation