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.
- (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.
(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)
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 Color Scheme
Air Quality Index
PM 2.5 Concentration (ug/m3)
Levels of Health Concern
is in this range:
|...air quality conditions are:||...as
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
|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 -- firstname.lastname@example.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.