Plot Speciation Data

NOTICE (posted January 3, 2008) - The speciation data provided on this page are based on the "standard sample values" in AQS which employ 1/2 mdl substitution for values below mdl. The exact methodology is documented on page 4-266 of the AQS Data Dictionary. We are considering posting the actual, reported values in the near future.

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