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Maine’s 2010 PM 2.5 & PM 10 Network and 2009 Data Analysis

Maine’s 2010 PM 2.5 & PM 10 Network and 2009 Data Analysis. Martha Webster Senior Meteorologist Maine DEP-BAQ 17 State House Station Augusta, ME 04333-0017 Tel: 207-287-8093 E-mail: martha.e.webster@maine.gov. Photo taken by Martha Webster Summer 2009. PM 2.5 NAAQS.

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Maine’s 2010 PM 2.5 & PM 10 Network and 2009 Data Analysis

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  1. Maine’s 2010 PM2.5 & PM10Network and 2009 Data Analysis Martha Webster Senior Meteorologist Maine DEP-BAQ 17 State House Station Augusta, ME 04333-0017 Tel: 207-287-8093 E-mail: martha.e.webster@maine.gov Photo taken by Martha Webster Summer 2009

  2. PM2.5 NAAQS • Primary 24hr average set at 35 µg/m3 • Primary annual average is currently 15 µg/m3 • Same note as in 2009: DC Circuit court ruled that EPA’s determination of annual & secondary standards was deficient. It was remanded to EPA but not revoked. So EPA will reconsider the annual standard and it will likely end up lower than 15 but not likely to be lower than 12 Current Annual DV for ME is below these levels but a revision will likely impact the AQI Good/Moderate break point because typically ‘Moderate’ begins at the annual standard. • AQI in the process of being finalized per previous NAAQS rulings. (Proposal breakpoints are as expected for the lower categories.) Will the possible annual revision further delay the AQI? Stay tuned.

  3. Forecasting Issues • Continue to work to correctly forecast winter particle pollution: it seems that each winter is different than the one before • Try to keep in mind when the Western Mtns region could have higher PM but no TEOM to verify. • The ‘new’ Portland site behaves a little differently than the previous site even though it is fairly close. Suspect different orientation between the monitor and winds/I-295.

  4. Significant Harm Level: • EPA also is proposing to set a Significant Harm Level (SHL) for PM2.5 equal to the proposed AQI value of 500, which is 500 μg/m3. Areas rarely reach PM concentrations of this level. • An SHL is an important factor in designing air pollution Emergency Episode Plans, which are required for certain areas of the country.

  5. PM2.5 2009 Data

  6. Data is preliminary

  7. PM2.5 Monitoring Network

  8. PM10

  9. PM10: aka Coarse Particles • PM10 NAAQS is 24 hr average of 150µg/m3 not to be exceeded more than once a year averaged over 3 years. • There is one continuous TEOM for PM10 in the state located in Presque Isle • Higher levels tend to be in late winter and early spring • Continue to place a mention of ‘coarse particle’ levels in the Status Notes during winter and in the Daily AQ Forecast discussion when windy conditions are expected. This is not an ‘official forecast’ just a note that winds could cause sand & salt to swirl around near roads and parking lots.

  10. AQI Values

  11. 2009 Data is preliminary

  12. March 10-26, 2009 Wind Data Boxes indicate High Madawaska PM10 2009 Data is preliminary

  13. PM10 Monitoring Network

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