Alaskan and Canadian forest fires exacerbate ozone pollution over Houston, Texas, on 19 and 20 July 2004.

Morris, G.A.; Hersey, S.; Thompson, A.M.; Pawson, S.; Nielsen, J.E.; Colarco, P.R.; McMillan, W.W.; Stohl, A.; Turquety, S.; Warner, J.; Johnson, B.J.; Kucsera, T.L.; Larko, D.E.; Oltmans, S.J.; Witte, J.C.