| 11. Rogue Valley Transport District, Rogue Valley, Oregon, US | | Giardina, Larry / The increasingly urbanized region served the Rogue Valley Transportation District (RVTD), home to nearly 130,000 people and situated in a valley at the convergence of the Cascade and Siskiyou mountain ranges in southwest Oregon, faces a continuing challenge to maintain air quality because of the local air shed's susceptibility to terrain-induced temperature inversions. |
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