About the Facility SIC Report - Criteria Air Pollutants

What does the report tell me?

The AirData Facility SIC report displays the number of air pollution point sources, by industry type, that emitted a criteria air pollutant (or precursor) during a year you specify. The report also gives the aggregate pollutant emissions for each industry type, which are identified by Standard Industrial Classification (SIC).

A point source is a stationary source of air pollutant emissions, such as an electric power plant or a factory, that can be identified by name and location. The terms "point source" and "facility" are equivalent.

Each row of the Facility SIC report displays the number of facilities in a single SIC, and the sum of their estimated annual emissions, by year. The Grand Total line(s) at the bottom of each report page shows the total number of sources in the report and their total emissions, by year.

What does the report look like?

In this report example, each row lists the number of facilities per industry type (SIC) that emitted nitrogen oxides (NOx) or sulfur dioxide (SO2), and the aggregate emissions of those facilities. The grand total row lists sums of those quantities for all facilities within the geographic scope of the report. The red arrow-button under the industry type column heading indicates that column determines report order, and values are in ascending order.

How can I customize the report?

Sort Order

You can use the SORT buttons in each report column to change the order of rows in the report. The default sort order is ascending SIC code.

Detail or Summary

This is always a summary report. Omitting optional report columns does not change the level of summarization. Each row of the report always represents a single SIC.

Pollutant - Single or Multiple

If you select a single pollutant, the report includes only sources emitting that pollutant, and one report column shows the emissions of that pollutant. If you select multiple pollutants, the report includes sources emitting any of them, and the report has multiple columns to show the emissions of each pollutant.

Year - Single or Multiple

The report includes a row for every combination of SIC and year in which there were emissions. If you select a single year, the number of rows is the number of SICs having emissions in that year. If you select multiple years, there are (normally) multiple rows for each SIC.

What do the report columns mean?

Row #: Sequence number of report rows (lines). Sequence numbers are not associated with particular rows; they simply enumerate the rows of a report from first to last. Thus, choosing an alternate sort order for a report would change the sequence numbers associated with particular rows.
Industry Type (SIC): The Standard Industrial Classification (SIC) of the primary activity performed or product produced by a source.

The U.S. Office of Management and Budget publishes the list of Standard Industrial Classifications, which are identified by codes of 2 to 4 digits. The NEI database uses detailed classifications, which have 4-digit codes. AirData reports list both the SIC code and description.
Year: The calendar year in which pollutant emissions occurred. This column is displayed only when you select multiple years for the report. If you select a single year, it is shown in the report title.
Number of Facilities: Number of air pollution point sources (facilities) within the industry type represented by a row of the report -- a single SIC and year.
Percent of Total Facilities: Fraction (percentage) of the report's Grand Total number of sources attributable to the industry type and year represented by a row of the report.
Pollutant Emissions: Estimated air pollutant emissions, in short tons, from all the point sources within the industry type and year represented by a row of the report. (A short ton is 2000 pounds.)

If you selected a particular pollutant, it is identified in the report heading. If you selected multiple pollutants, the report includes a column for each one, and pollutant names are in the column headings.

An emissions estimate is based on the normal operating schedule of each source, and includes the effects of installed pollution control equipment and regulatory restrictions on operating conditions. This is called estimated emissions with rule effectiveness.
Percent of Total Emissions: Fraction (percentage) of the report's Grand Total emissions attributable to the industry type and year represented by a row of the report.

If you selected multiple pollutants, the report includes a percentage column for each pollutant, corresponding to the columns for emissions. Otherwise, the report has a single percentage column.