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California Air Resources Board
ARB's Aerometric Data Analysis and Management system
Air Quality Data Statistics Frequently
Asked
Questions
Select and View Air Quality Data for Various Pollutants throughout the State
Select 8 Summary:  Air Quality Summaries Tailored to Your Needs
Select any combination of statistics & years that produces up to 8 output columns
Trends Summaries:  Air Quality Trends Summaries
Year-to-year trends in key air quality statistics
Top 4 Summary:  Top 4 Measurements and Days Above the Standard
Top 4 measurements, annual averages, and days above standards
Hourly Listing:  24 Hourly Measurements for a Site and Day
24 hourly measurements for the day and site you choose
Weekly Listing:  Daily Statistics in a 10-Week Listing
Daily statistics of your choice in a moveable 10-week window
Toxics Summaries:  Statewide & Site-by-Site Toxics Summary Statistics
Annual statistics, including average and risk
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