1. OZONE Monitoring Network
2016 Annual AQ Monitoring Meeting
Tom Downs, CCM
Chief Meteorologist
MAINE DEPARTMENT OF ENVIRONMENTAL PROTECTION
Protecting Maine’s Air, Land and Water

2. OZONE STANDARD REVISIONS
Effective December 26, 2015
70 ppb for both the primary and secondary 8-hour Ozone NAAQS – with new AQI breakpoints (55-70 ppb = Moderate)
Final Attainment/nonattainment Designations will use data.
Changes to data handling conventions
Only looks at 17 of 24 possible 8-hr running averages to eliminate “double counting” of exceedances (could miss some exceedances)
For days with less than 75% data recovery rates (< 13 instead of 17 valid 8-hr averages) the daily maximum 8-hr concentration is valid if it’s greater than the NAAQS.
MAINE DEPARTMENT OF ENVIRONMENTAL PROTECTION 2

3. When is the best time to do “cal-checks”?3

4. MAINE DEPARTMENT OF ENVIRONMENTAL PROTECTION www.maine.gov/dep
2015 Ozone Season Review
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5. MAINE DEPARTMENT OF ENVIRONMENTAL PROTECTION www.maine.gov/dep
2015 Ozone Monitoring Network
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6. MAINE DEPARTMENT OF ENVIRONMENTAL PROTECTION www.maine.gov/dep6

7. MAINE DEPARTMENT OF ENVIRONMENTAL PROTECTION www.maine.gov/dep
NOAA - National Oceanic and Atmospheric Administration
AQFS – National Air Quality Forecast System
CMAQ – Community Multi-scale Air Quality modeling system
BIAS – Difference between the model prediction and the observed maximum 8-hr ozone concentration
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8. MAINE DEPARTMENT OF ENVIRONMENTAL PROTECTION www.maine.gov/dep
May 4, hr back trajectories (10 meters). All hours when a Maine site had a 1-hour concentration > 70 ppb
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9. MAINE DEPARTMENT OF ENVIRONMENTAL PROTECTION www.maine.gov/dep
July 30, hr back trajectories (10 meters and 250 meters). All hours when a Maine site had a 1-hour concentration > 70 ppb
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10. MAINE DEPARTMENT OF ENVIRONMENTAL PROTECTION www.maine.gov/dep
August 18, hr back trajectories (10 meters and 250 meters). All hours when a Maine site had a 1-hour concentration > 70 ppb
MAINE DEPARTMENT OF ENVIRONMENTAL PROTECTION 10

11. MAINE DEPARTMENT OF ENVIRONMENTAL PROTECTION www.maine.gov/dep
September 18, hr back trajectories (10 meters and 250 meters). All hours when a Maine site had a 1-hour concentration > 70 ppb
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12. MAINE DEPARTMENT OF ENVIRONMENTAL PROTECTION www.maine.gov/dep
Design Values and Trends
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13. MAINE DEPARTMENT OF ENVIRONMENTAL PROTECTION www.maine.gov/dep13

14. MAINE DEPARTMENT OF ENVIRONMENTAL PROTECTION www.maine.gov/dep
Threshold = what th highest 8-hour daily maximum ozone concentration will cause an area in Maine to be designated nonattainment.
Latest year to reach the threshold:
Cadillac Mt – 2007
Cape Elizabeth – 2007
Kennebunkport – 2002
Port Clyde – 2002
McFarland Hill – 2002
Gardiner
All others – threshold never reached
October 2016 – State recommended attainment/nonattainment designations due to EPA
October Final designations using data.
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15. MAINE DEPARTMENT OF ENVIRONMENTAL PROTECTION www.maine.gov/dep15

16. MAINE DEPARTMENT OF ENVIRONMENTAL PROTECTION www.maine.gov/dep16

17. MAINE DEPARTMENT OF ENVIRONMENTAL PROTECTION www.maine.gov/dep
2016 Ozone Network
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18. 2016 Ozone Network 18 Moved North Lovell site to Bethel
Moving Bowdoinham site closer to coastline (Phippsburg/Popham Beach)
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