California Department of Public Health logo: three likenesses of people colored blue, green, and orange  
Sign-In  
sky



Join our list

Get updates on our project activities and new features of our website. Sign up for our newsletter here.


Contact Us

California Environmental Health Tracking Program

850 Marina Bay Pkwy, P-3
Richmond, CA 94804

(510) 620-3038
E-Mail Us
Last Edited: 6/25/2012

Air Quality Data Query Results

This query system automatically generates a table, map, and chart using the criteria you have chosen. To see the data in your desired format, click on the corresponding tabs below. View the Info tab to learn about the data and how they can be used. View the Sources tab for information about the underlying data sources.

To modify your query, click on the yellow box to the right. Options for other ways to visualize the data are listed on the right side bar.

Data Sources & Limitations

Data for PM2.5, PM10, and ozone indicators

Air quality data are from the United States Environmental Protection Agency (EPA), EPA Air Explorer (http://epa.gov/mxplorer/index.htm) and the United States Census.

Limitations with air quality data

There can be considerable variability in the number of high PM2.5, PM10, and ozone days per year so tracking trends over time needs to be done carefully. The variability results from:

  • The number of high days is related to meteorological factors (e.g., temperature and mixing heights).
  • There are a small number of events per year, so for statistical reasons this type of extreme value measure will bounce around more than the average.

It is important to understand that these measures are not used for compliance determination with the National Ambient Air Quality Standard (NAAQS), nor are they used to further progress toward attaining compliance.

The majority of PM2.5 and PM10 monitors do not take measurements everyday and operate on different schedules. Thus the number of short term events (e.g. days exceeding the NAAQS) is uncertain, and estimating measures that are representative of short term exposures over a year is complex.

For short-term measures, the monitor with the highest reading on any day is used in the measure. Larger areas will have a broader range of pollution values and perhaps more monitors that may measure a high value on a given day. Thus day and person day estimates for larger areas may be biased higher than estimates for smaller areas.

Data for traffic indicator

Traffic data are from CalTrans Highway Performance Monitoring System (HPMS) (2004) and population data is based on the U.S. Census 2000.

Limitations with traffic data

Traffic data are sampled in various locations at intermittent times and do not distinguish between automotive and truck traffic. The traffic data are more representative of urban populations than rural populations; rural populations can be exposed to pollution from busy roads, but fewer individuals are exposed than in urban areas.

* To see more-detailed county-specific data, click on the county name in the Table tab

* Request more air information from CEHTP

Notes about the data

    [[indicatorHTML]]
 

Notes about the data

    [[indicatorHTML]]
 

Notes about the data

    [[indicatorHTML]]
 
  • PM2.5 (particulate matter with a diameter of less than 2.5 microns) is a Criteria Air Pollutant commonly found in diesel exhaust. For more information...
  • Exposure to PM2.5 has been associated with asthma attacks and reduced lung function. For more information...
  • Data Source: United States Environmental Protection Agency (EPA), EPA Air Explorer, [[year]]. For more information...
  • If the county is not listed or has a value of "NA", the data are not available due to the lack of air monitors in that county.
  • PM2.5 (particulate matter with a diameter of less than 2.5 microns) is a Criteria Air Pollutant commonly found in diesel exhaust.For more information...
  • Exposure to PM2.5 has been associated with asthma attacks and reduced lung function.For more information...
  • Data Source: United States Environmental Protection Agency (EPA), EPA Air Explorer [[year]], and the 2000 U.S. CensusFor more information...
  • If the county is not listed or has a value of "NA", the data are not available due to the lack of air monitors in that county.
  • PM10 (particulate matter with a diameter of less than 10 microns) is a Criteria Air Pollutant that comes from motor vehicles, wildfires, and industrial sources. For more information...
  • Exposure to PM10 has been linked to asthma attacks, bronchitis, and other lung diseases.For more information...
  • Data Source: United States Environmental Protection Agency (EPA), EPA Air Explorer, [[year]]. For more information...
  • If the county is not listed or has a value of "NA", the data are not available due to the lack of air monitors in that county.
  • PM10 (particulate matter with a diameter of less than 10 microns) is a Criteria Air Pollutant that comes from motor vehicles, wildfires, and industrial sources. For more information...
  • Exposure to PM10 has been linked to asthma attacks, bronchitis, and other lung diseases. For more information...
  • Data Source: United States Environmental Protection Agency (EPA), EPA Air Explorer, [[year]], and the 2000 U.S. Census. For more information...
  • If the county is not listed or has a value of "NA", the data are not available due to the lack of air monitors in that county.
  • PM10 (particulate matter with a diameter of less than 10 microns) is a Criteria Air Pollutant that comes from motor vehicles, wildfires, and industrial sources. For more information...
  • Exposure to PM10 has been linked to asthma attacks, bronchitis, and other lung diseases.For more information...
  • Data Source: United States Environmental Protection Agency (EPA), EPA Air Explorer, [[year]]. For more information...
  • If the county is not listed or has a value of "NA", the data are not available due to the lack of air monitors in that county.
  • PM10 (particulate matter with a diameter of less than 10 microns) is a Criteria Air Pollutant that comes from motor vehicles, wildfires, and industrial sources. For more information...
  • Exposure to PM10 has been linked to asthma attacks, bronchitis, and other lung diseases. For more information...
  • Data Source: United States Environmental Protection Agency (EPA), EPA Air Explorer, [[year]], and the 2000 U.S. Census. For more information...
  • If the county is not listed or has a value of "NA", the data are not available due to the lack of air monitors in that county.
  • PM10 (particulate matter with a diameter of less than 10 microns) is a Criteria Air Pollutant that comes from motor vehicles, wildfires, and industrial sources.For more information...
  • Exposure to PM10 has been linked to asthma attacks, bronchitis, and other lung diseases.For more information...
  • Data Source: United States Environmental Protection Agency (EPA), EPA Air Explorer, [[year]].For more information...
  • If the county is not listed or has a value of "NA", the data are not available due to the lack of air monitors in that county.
  • Ground-level ozone is found in urban smog and forms when oxides of nitrogen interact with volatile organic compounds in the presence of sunlight. For more information...
  • Exposure to ozone causes lung inflammation, damages lung tissue, and may cause asthma. For more information...
  • Data Source: United States Environmental Protection Agency (EPA), EPA Air Explorer, [[year]]. For more information...
  • If the county is not listed or has a value of "NA", the data are not available due to the lack of air monitors in that county.
  • Ground-level ozone is found in urban smog and forms when oxides of nitrogen interact with volatile organic compounds in the presence of sunlight.For more information...
  • Exposure to ozone causes lung inflammation, damages lung tissue, and may cause asthma.For more information...
  • Data Source: United States Environmental Protection Agency (EPA), EPA Air Explorer, [[year]], and the 2000 U.S. Census.For more information...
  • If the county is not listed or has a value of "NA", the data are not available due to the lack of air monitors in that county.
  • Ground-level ozone is found in urban smog and forms when oxides of nitrogen interact with volatile organic compounds in the presence of sunlight. For more information...
  • Exposure to ozone causes lung inflammation, damages lung tissue, and may cause asthma. For more information...
  • Data Source: United States Environmental Protection Agency (EPA), EPA Air Explorer, [[year]]. For more information...
  • If the county is not listed or has a value of "NA", the data are not available due to the lack of air monitors in that county.
  • Ground-level ozone is found in urban smog and forms when oxides of nitrogen interact with volatile organic compounds in the presence of sunlight.For more information...
  • Exposure to ozone causes lung inflammation, damages lung tissue, and may cause asthma.For more information...
  • Data Source: United States Environmental Protection Agency (EPA), EPA Air Explorer, [[year]], and the 2000 U.S. Census.For more information...
  • If the county is not listed or has a value of "NA", the data are not available due to the lack of air monitors in that county.
  • PM2.5 (particulate matter with a diameter of less than 2.5 microns) is a Criteria Air Pollutant commonly found in diesel exhaust.For more information...
  • Exposure to PM2.5 has been associated with asthma attacks and reduced lung function.For more information...
  • Data Source: United States Environmental Protection Agency (EPA), EPA Air Explorer, [[year]].For more information...
  • If the county is not listed or has a value of "NA", the data are not available due to the lack of air monitors in that county.
  • Ground-level ozone is found in urban smog and forms when oxides of nitrogen interact with volatile organic compounds in the presence of sunlight.For more information...
  • Exposure to ozone causes lung inflammation, damages lung tissue, and may cause asthma.For more information...
  • Data Source: United States Environmental Protection Agency (EPA), EPA Air Explorer, [[year]]. For more information...
  • If the county is not listed or has a value of "NA", the data are not available due to the lack of air monitors in that county.
  • Harmful air pollutants are commonly found in motor vehicle exhaust.For more information...
  • Residence near busy roads has been associated with a variety of health outcomes, including heart disease, asthma, and reproductive outcomes.For more information...
  • Data Source: CalTrans Highway Performance Monitoring System (HPMS), 2004, and the U.S. Census 2000.
  • A busy road is defined as a road with an average of more than 10,000 vehicles per day. A person is considered to live near a busy road if their residence is within 300 meters of such a road.
  •