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About SiefkesPetit

SiefkesPetit Communications (say SEEF-kis PET-it) is a PR firm specializing in commercial trucking and off-highway equipment markets including construction, agriculture, and defense. Contact us here: 

317 N.W. Gilman Blvd. #39
Issaquah WA 98027

Phone: 425-392-2611
Fax: 425-392-2454

» Download a summary of what we do (113K PDF)

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Editors should take a closer look at a University of California-Berkeley study released Oct. 22. The study estimates diesel exhaust is responsible for 65-90 percent of a region’s vehicular-derived secondary organic aerosol (SOA), a major component of smog, depending upon the relative amounts of gasoline and diesel used in the area.


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