The Statistical Abstract files are distributed by the US Census Department as Microsoft Excel files. These files have data mixed with notes and references, multiple tables per sheet, and, worst of all, the table headers are not easily matched to their rows and columns.

A few files had extraneous characters in the title. These were corrected to be consistent. A few files have a sheet of crufty gibberish in the first slot. The sheet order was shuffled but no data were changed.

The tables that were changed (this is table 359):

0166 0257 0362 0429 0445 0446 0459 0461 0462 0464 0465 0466 0467
0469 0479 0480 0481 0482 0483 0484 0485 0486 0487 0559 0628 0629
1144 1227 1231

This dataset consists of a table of 18 rows and 13 columns.

Data for 1990 through 2004 has been revised. Data represent annual composite averages of pollutant based on daily 24-hour averages of monitoring stations, except carbon monoxide is based on the second-highest, nonoverlapping, 8-hour average; ozone, the second-highest daily maximum 1-hour value or the fourth-highest maximum 8-hour value; and lead, the maximum quarterly average of ambient lead levels. Based on data from the Air Quality System. @mg/m3 = micrograms of pollutant per cubic meter of air; ppm = parts per million. Also see document at http://www.epa.gov/airtrends/index.html

Footnotes

1. Refers to the primary National Ambient Air Quality Standard.
2. Based on 8-hour standard of 9 ppm.
3. Based on 1-hour standard of .12 ppm.
4. Based on 8-hour standard of .08 ppm.
5. Based on 24-hour (daily) standard of 150mg/m3. The particulates (PM-10) standard replaced the previous standard for
   total suspended particulates in 1987. In 2006, EPA revoked the annual PM-10 standard.
6. The PM-2.5 national monitoring network was deployed in 1999. National trend data prior to that time is not available.
7. Based on 3-month standard of 1.5 @mg/m3.

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