Air Pollutants and Our Health
Air quality advisories are issued to alert the public about poor air quality in some part of the county. An Air Quality Watch is issued when there is potential for poor air quality in some area of the county; an Air Quality Warning is issued when there is already poor air quality in some part of the county. An advisory may be issued when high winds are producing high particle levels, or when smoke from a wildfire is impacting the county. To subscribe to receive the District's air quality advisories, see this page.
Air quality standards define clean air and tell us how much of a substance can be in the air without causing harm. See this page for more information.
In most cases, California's air quality standards are more protective of health than the federal standards. Santa Barbara County was designated unclassifiable/attainment for the 2008 federal 8-hour ozone standard on April 30, 2012. (The 1-hour federal ozone standard was revoked for Santa Barbara County). The County is also considered in attainment for the state 1-hour standard for ozone as of June, 2007. The California 8-hour ozone standard was implemented in May, 2006. The County violates the state 8-hour ozone standard and the state standard for PM10. The County is in attainment for the federal PM2.5 standard and the state PM2.5 standard (based on monitored data from 2006-2008). For more information on our attainment status, see Santa Barbara County Air Quality Attainment Designation.
On some days we breathe unhealthy air. We are required to adopt Clean Air Plans to show how we will reduce air pollution in order to attain the clean air standards, and to report the Air Quality Index (AQI), a scale of actual levels of ozone and other common pollutants in the air in relation to their health standard. To view historical statistics on ozone and particle pollution levels in Santa Barbara County and other areas, see this page on the California Air Resources Board site.
Ozone is a gas created when NOx (nitrogen oxides) and VOCs (volatile organic compounds) react chemically in the presence of sunlight and heat. Ozone is a primary ingredient of smog.
Ozone occurs in two layers of the Earth’s atmosphere.
To read more about ozone and our health, including how ozone damages our lungs, and who is at risk, see this page.
Santa Barbara County's ozone season typically runs from April through October. The chart below shows exceedances of current air quality standards from 1990 through 2011 compared with the population growth over the same time period. The California 8-hour ozone standard became effective May 2006. Exceedances of this standard prior to 2006 depicted below were not actual exceedances but represent levels of ozone that would have exceeded the standard had it been in place at the time.
Fine mineral, metal, soot, smoke, and dust particles suspended in the air can harm our lungs. For health reasons, we are most concerned with inhalable particulate matter less than 10 micrometers in diameter (PM10), and less than 2.5 micrometers in diameter (PM2.5). Particles of these sizes can permanently lodge in the deepest and most sensitive areas of the lung, and can aggravate many respiratory illnesses including asthma, bronchitis, and emphysema. High levels of particle pollution have also been associated with a higher incidence of heart problems, including heart attacks.
Sizes of particulate matter smaller than 2.5 microns in
diameter (PM2.5) and smaller than 10 microns in diameter
Air toxics are chemicals released into the air that are known or suspected to cause cancer, or other serious health problems, such as birth defects or reproductive effects.
The District oversees the implementation of California's Air Toxics "Hot Spots" Program in Santa Barbara County, to reduce the public health risk from air toxics. Under this program, businesses record their use of air toxics, and businesses that are creating a significant public health risk through release of these chemicals are required to reduce that risk. See this page to view additional information on air toxics, and on the District's program.
Vehicle exhaust contains substantial amounts of air toxics. The California Air Resources Board has identified diesel exhaust particulate as the number one airborne carcinogen in the state. Download the state's brochure on air toxics (PDF file) here.
Greenhouse gases, including carbon dioxide, methane, nitrogen oxide (as N2O, nitrous oxide), and hydrofluorocarbons, trap heat in the Earth's atmosphere in a process known as the "greenhouse" effect. Human activities, primarily the burning of fossil fuels, are causing these gases to build up in the atmosphere. The result is global warming, also referred to as climate change. APCD does not regulate sources of greenhouse gases. However, APCD rules affecting sources of particle and smog-forming pollutants will also result in some greenhouse gas emission reductions. For more information and links, see our climate change page.
To view historical information on ozone and particle pollution levels in Santa Barbara County, and numbers of exceedances of standards by year, see this page on the California Air Resources Board site.
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