Code of Federal Regulations Title 40. Protection of Environment 40 CFR Pt. 53, Subpt. C, Tbl. C-5 Table C–5 to Subpart C of Part 53—Summary of Comparability Field Testing Campaign Site and Seasonal Requirements for Class II and III FEMs for PM 10-2.5 and PM 2.5

PM_2.5

Test site location area

Los Angeles basin or California Central Valley

Western city such as Denver, Salt Lake City, or Albuquerque

Midwestern city

Northeastern or mid- Atlantic city.

Test site characteristics

Relatively high PM_2.5, nitrates, and semi-volatile organic pollutants

Cold weather, higher elevation, winds, and dust

Substantial temperature variation, high nitrates, wintertime conditions

High sulfate and high relative humidity.

Class III Field test campaigns (Total: 5)

Winter and summer

Winter only

Winter only

Summer only.

Class II Field test campaigns (Total: 2)

Site A or B, any season

Site C or D, any season.

PM_10-2.5

Test site location area.

Los Angeles basin or California Central Valley

Western city such as Las Vegas or Phoenix

Midwestern city

Large city east of the Mississippi River.

Test site characteristics

Relatively high PM_2.5, nitrates, and semivolatile organic pollutants

High PM_10-2.5 to PM_2.5 ratio, windblown dust

Substantial temperature variation, high nitrates, wintertime conditions

High sulfate and high relative humidity.

Class III Field test campaigns (Total: 5)

Winter and summer

Winter only

Winter only

Summer only.

Class II Field test campaigns (Total: 2)

Site A or B, any season

Site C or D, any season.