Data and Statistics
This page last reviewed January 25, 2010
The California Air Resources Board (ARB) gathers air quality data for the
State of California, ensures the quality of this data, designs and
implements air models, and sets ambient air quality standards for
the state. ARB compiles the state's emissions inventory and
performs air quality and emissions inventory special studies.
The Air Quality Data page provides access to ambient air
quality data, maps of areas that violate the national and state
air quality standards, and maps of the ambient air quality
monitoring network.
The ARB uses the Emissions Inventory and Air Quality Models to
evaluate air quality and reduce emissions in each of the 35 local air
districts.
Air Quality Data
The main page for data, statistics and other information on California’s air quality.
Today's Air Quality
The AQMIS2 web site provides access to near real-time and official air
quality and
meteorological data for California. This page provides links to
specialized ozone pages, data query tools, maps, and other products
such as the ability to plot or download data.
The query tools can provide detailed information that can be summarized
by area or by site and can provide hourly, daily, or summarized
statistics.
Air Quality Data Statistics
The iADAM web site lets you see official summaries indicating how good or bad the air
quality is throughout California for a number of pollutants. For
example, you can view the number of days per year that air quality is
deemed to be unhealthy, and how this has changed over the years. Toxics
data summaries are also available.
Air Quality Monitoring Network
Here you will find a listing of the air quality monitoring sites in
California and what
pollutants are monitored at each site. Tables indicate how many years
of data are available for each site. Includes maps of the site
locations.
Standards and Designations
The ARB designates areas of California for each criteria pollutant
based on recent ambient
air quality data. The Area Designations provides information regarding
the designation areas in California with respect to the State Ambient
Air Quality Standards. Areas can be designated as attainment,
nonattainement, or unclassified.
Current Air Quality Standards
This page describes California’s ambient air quality standards currently in
effect.
Standards Under Review
This page provides information about the current review of
California ambient air
quality standards mandated by the Children's Environmental Health
Protection Act (CEHPA, Senate Bill 25, Escutia, 1999).
Air Quality Index (AQI)
The U.S. EPA's Air Quality Index (AQI) provides accurate, timely and easily understandable
information about daily levels of air pollution.
Emission Inventory
An emission inventory is an estimation of air pollution that helps us answer
questions about what pollutants are being emitted, how much is being
emitted, and where they are coming from.
Air Quality Models
Air quality modeling software and associated documentation.
Southern California Studies
Air quality modeling studies in Southern California.
Central California Studies
Air quality modeling studies in Central California.
Frequently Asked Questions
Easy to understand information for commonly asked questions about ambient air quality in
California. Learn how air quality varies statewide. Learn how to tell
how polluted the air is where you live and work.
Transport
This web area describes the State's triennial transport assessment program including the
identification of transport couples and the associated mitigation
regulations.
Demographic Data
California Demographic and financial data from the Department of Finance.