AQS Guidelines for Reporting 5-minute SO2 Data January 3, 2011

Dear AQS User:

Please use these guidelines when reporting the 5-minute SO₂data. (These are specifically for the SO₂ reporting changes that were outlined in the November 3, 2010 memo “AQS Technical Note – NAAQS Reporting Issues for NO₂ and SO₂ NCORE Reporting Issues for NO_y and trace-level gases.”)

If you are reporting: Use AQS Use AQS Use POC:

Notes
maximum 5-minute SO₂ average from each hour	42406	1	Use of POC 1 is suggested but not required.	Meets the reporting requirement for SO₂ 5-minute data. (Other option is to load all the 5-minute data. See below.)

all of the twelve 5minute averages from each hour	42401	H	Often 42401 duration “1” data is reported as POC 1, so the use of POC 2 (if available) is suggested but not required.	Meets the reporting requirement for SO₂ 5-minute data. (Other option is to load the maximum 5minute average for each hour. See

all of the twelve 5minute averages from each hour

42401

Often 42401 duration “1” data is reported as POC 1, so the use of POC 2

(if available) is suggested but not required.

Meets the reporting requirement for SO₂ 5-minute data.

(Other option is to load the maximum 5minute average for each hour. See

parameter code: duration code: above.)

Since “42401” is also used for hourly SO₂(duration 1) data, a new POC must be established. If you try to load 5minute data to the existing monitor being used for hourly data, you will get the error: “Sample duration cannot change within a calendar year.”

If using this option, the maximum 5 minute average for each hour does not have to be identified and separately reported. Before loading any 5-minute SO₂ raw data into AQS, establish the new monitor with the appropriate parameter and POC.