Query 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.

Step 1: Select a Data Set
Ambient PM2.5 Speciation Data (All measured and computed components)
OR
SANDWICH modeled PM2.5 FRM Components
	The SANDWICH technique uses the speciation data to provide estimates of PM2.5 components as they might be measured by the PM2.5 Federal Reference Method. For more information, link to SANDWICH description or data dictionary.
Major PM2.5 FRM Components
All Raw Data Components

Step 2: Select an Area or All Sites
Area
County:
MSA:
Region:
OR
All Sites


Step 3: Select Dates
From
To

Step 4: Select Options
Download Spreadsheet View Online

Step 5: Submit Selections

Query Speciation Data

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