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PM Map Demonstration

During the summer of 2002, NESCAUM generated some preliminary demonstration PM maps. The following maps are based on preliminary unvalidated data:

These maps now include the Eastern Canadian Provinces as well as the MANE-VU states and some mid-atlantic and mid-west states. These maps are based on a running 3-hour* average of hourly PM2.5 data, not the 24-hour mean required by the PM AQI. The maps above are concentration isopleths, and are not linked to AQI concentrations. Note that the isopleth values are different for these two maps, due to the extreme concentrations observed during the forest fire event. Comments on these maps are welcome to George Allen.

The forest fire smoke event continued in some areas beyond July 9th. The map below shows New Brunswick and Newfoundland 3-hour* mean PM2.5 for the period form July 7th to July 14th.

July 07, 2002 PM Map
(note: Local time is of Newfoundland (UTC -3.5). Hence, data from Nova Scotia and New Brunswick are off by 30 min.)

The following maps use a 24-hour running average interval as required by the current version of the U.S. EPA PM2.5 Air Quality Index (AQI). The first pair of maps use the AQI color scale, with color breakpoints at 15, 40, 65, and 150 ug/m3. The second set of maps map uses the same data but with 10 ug/m3 concentration isopleths.

AQI

(end of the 24-hour interval)

Concentration Isopleths

(end of the 24-hour interval)

AQI

(centered 24-hour interval)

Concentration Isopleths

(centered 24-hour interval)

The following maps are based on a weighted end of 12-hour average approach developed by EPA-Region 1 (Boston Office) to make the PM map more responsive to rapid changes in concentrations than the simple running 24-hour average map. These maps use the most recent 12 hours of data with the most recent 4 hours being weighted 3 times more than the other hours.

AQI

Concentration Isopleths

AQI Color Scheme

Air Quality Index
(AQI) Values
PM 2.5 Concentration (ug/m3)
Levels of Health Concern
Colors
When the AQI
is in this range:
  ...air quality conditions are: ...as symbolized
by this color:
0 to 50 0.0 to 15.4 Good Green
51 to 100 15.5 to 40.4 Moderate Yellow
101 to 150  40.5 to 65.4 Unhealthy for
Sensitive Groups
Orange
151 to 200 65.5 to 150.4 Unhealthy Red
201 to 300 150.5 to 250.4 Very Unhealthy Purple
301 to 500 250.5 to 500.4 Hazardous Maroon

 



The MapGen input files for these maps are available on request to George Allen -- gallen2@nescaum.org

MapGen software is available at no cost at http://www.baronams.com/OMS/

Microsoft GIF Animator version 1.08 is available for download for more viewing capabilities of the animated PM maps







* All 3-hour means are assigned to the beginning of the 3-hour period.

PM Map Demonstration

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