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Ozone Update

Ozone Update. Ben Wells U.S. Environmental Protection Agency Office of Air Quality Planning and Standards Air Quality Analysis Group February 11, 2014. Overview. Past: Ozone data through 2012 2012 ozone trends and design values Influence of meteorology Present: Preliminary 2013 data

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Ozone Update

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  1. Ozone Update Ben Wells U.S. Environmental Protection Agency Office of Air Quality Planning and Standards Air Quality Analysis Group February 11, 2014

  2. Overview • Past: Ozone data through 2012 • 2012 ozone trends and design values • Influence of meteorology • Present: Preliminary 2013 data • Preview of 2013 ozone data • Public data access tools • Future: 2013 design values and trends updates

  3. Ozone Trend, 2000 - 2012 • The national average of the annual 4th highest concentrations: • Decreased by 9% from 2000 to 2012 • Decreased by 21% from 2002 to 2009 • Increased by 8% from 2009 to 2012 90th Percentile 50th Percentile 10th Percentile

  4. Change in 8-hour Ozone Design Values 2009-2011 to 2010-2012 Average increase of 2.0 ppb

  5. Influence of Meteorology on Ozone • Ozone tends to be highest on hot, dry days with calm or light winds • Meteorological conditions are more favorable toward ozone formation in some years than in others • EPA uses a statistical model to “adjust” seasonal average ozone trends to remove effects due to meteorological variability

  6. Influence of Meteorology on Ozone (< 60 ppb) (60 – 75 ppb) (76 – 95 ppb) (96 – 115 ppb) (> 115 ppb)

  7. Meteorology: 2012 vs. 2013Source: National Climatic Data Center (http://www.ncdc.noaa.gov/) April – September 2012 April – September 2013 Temperature ← Cooler Average Warmer → Precipitation ← Drier Average Wetter →

  8. Change in May - September Mean8-hour Ozone Values, 2012 to 2013(2013 values based on preliminary data) Average decrease of 5.2 ppb

  9. Change in Annual 4th Highest 8-hour Ozone Values, 2012 to 2013(2013 values based on preliminary data) Average decrease of 7.2 ppb

  10. Public Data Access Tools • AirData: http://www.epa.gov/airdata/ • Download daily air quality concentration data or annual summary statistics for any monitor or geographic area • Several visualization tools for generating downloadable graphics based on air quality concentration data • Provides the latest data available in EPA’s AQS database • AirTrends: http://www.epa.gov/airtrends/ • View or download trends in EPA’s six criteria pollutants, nationally, regionally, and locally • Download official design values for EPA’s six criteria pollutants • Updated annually by AQAG (August)

  11. 2013 Design Values and Trends Updates • May 1, 2014 – Deadline for 2013 air quality data certification in AQS • May – AQAG retrieves data from AQS and generates draft 2013 design value tables • June – EPA regional office review of draft design values • Late June/early July – AQAG retrieves data from AQS for final design values and trends • July/August – AQAG generates final 2013 design value tables and updates trends information • August 2014 – AQAG updates the AirTrends webpage

  12. ? ? ? Questions ? ? ?

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