1.5 PM Supersites Program

2

3 This program provided highly resolved aerosol measurements at eight U.S. cities for

4 several time periods from 1999 through 2004, with some sites collecting data after 2004.22 A

5 number of instrument configurations were deployed, ranging from additional locations for

6 standard speciation monitors, to systems capturing near-continuous size-dependent speciation

7 profiles.

8

9 2. Composition of PM2.5

10

11 Particulate matter (PM) is a highly complex mixture of solid particles and liquid droplets

12 distributed among numerous atmospheric gases which interact with solid and liquid phases.

13 Particles range in size from those smaller than 1 nanometer (10-9 meter) to over 100 microns (1

14 micron is 10-6 meter) in diameter (for reference, a typical strand of human hair is 70 microns and

15 particles less than about 20 microns generally are not detectable by the human eye). Particles are

16 classified as PM2.5 and PM10-2.5, corresponding to their size (diameter) range in microns and

17 referring to total particle mass under 2.5 and between 2.5 and 10 microns, respectively.

 

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