Air Quality Data (1980-1999) from the California Air Resources Board

The California Air Resources Board has available two CD-ROMs (CDs) with 20
years of air quality data. Both CDs contain essentially the same air quality
data, but provide these data in different formats. The CDs contain 20 years
of Criteria Pollutant air quality data (1980-1999), 10 years of Toxics air
quality data (1990-1999), 12 years of dichotomous sampler (Dichot) data
(1988-1999), and 6 years of non-methane organic compound (NMOC) data
(1994-1999). These CDs are updates to the air quality data CDs released
before 2001. One of the many new additions to the new CDs is a hyperlinked
version of supporting documents.

The first CD contains data that are displayed graphically using Voyager (a
program contained on the CD, which displays data on maps and as time series
graphs). This CD also includes annual data summaries in table format, which
can be viewed using selection buttons and pull-down menus. Graphing templates
are available for plotting the annual data trends. The CD runs under
Windows 3.1 and higher. Request CD Number: PTSD-00-013-CD

The second CD contains the same data content as the first CD, but stores the
data in other forms (ASCII, DBF, etc.) used by analysts who process their own
data. This CD also includes annual and daily summaries in table format, which
are accessible through selection buttons and pull-down menus. Graphing
templates are available for plotting the annual data trends. Request CD
Number:
PTSD-00-014-CD

There was not enough space to carry complete hourly data for all the years.
Consequently, the hourly data for the earliest years have been made available
for downloading from the internet:

Voyager hourly files 1980-1989
ASCII hourly files 1980-1989
"http://www.arb.ca.gov/aqd/aqdcd/aqdcddld.htm"