MO - Primary Monitor Period

This transaction is used to specify the primary monitor at a site for NAAQS purposes. A primary monitor period may be created for any parameter, but are required for the following:

  • 14129 (TSP Lead at LC)

  • 85129 (PM10 Lead at LC)

  • 42602 (NO2)

  • 88101 (PM2.5)

When monitors for these parameters are created at a site, a primary monitor period record for that parameter must be in effect for the site. AQS uses this record to perform site level data combinations and data substitution of missing values for NAAQS-related calculations.

If only one monitor for a listed parameter exists at a site, then that monitor will be the primary monitor for the site. Primary monitor periods are specified for date ranges.

Examples:

MO transaction in default mode
MO|I|TT|614|7001|88101|1|20020701|20030821|
MO transaction in Tribal mode
MO|I|TT|183|0001|88101|1|19990501|19990502|

Format

MO - Primary Monitor Period transaction format

Seq.

Name

Description

Formatting Rules

Required

Key

1

Transaction Type

Monitor Primary Period transaction identifier.

Must = MO

Always

2

Action Indicator

Indicator for Insert, Update, or Delete action.

Must = I, U, or D

Always

3

State Code / Tribal Indicator

The FIPS state code of the monitor, or “TT” to indicate that the next field on the transaction is a Tribal code.

Must exist in STATES Reference Table or be ‘TT’ for Tribal Site

Always

Y

4

County Code / Tribal Code

The FIPS County Code of the site. If the previous field on the transaction contains “TT”, then the Tribal Code of the site.

Must exist in COUNTIES (for state) or TRIBAL_AREAS Reference table

Always

Y

5

Site Number

Four digit number to uniquely identify site in county and/or tribe.

Must exist in SITES table with {State Code, county Code} or Tribal Code

Always

Y

6

Parameter Code

The AQS parameter code assigned to the monitor in AQS.

Must exist in PARAMETERS reference table.

Always

Y

7

POC

Parameter Occurrence Code: One or two digit number identifying a specific monitor for a parameter at the site.

Must exist in MONITOR table for non-Insert actions.

Always

Y

8

Begin Date

Beginning of date range where the monitor is the primary for the parameter at the site.

YYYYMMDD.

Always

Y

9

End Date

End of date range where the monitor the primary for the parameter at the site.

YYYYMMDD.

No