21.   Professor Philippe Leuenberger of the University Hospital Center in Lausanne, Switzerland, said repeated exposed to the diesel exhaust could lead to chronic inflammation, coughing and wheezing.

22.   The Bush administration will let stand Clinton-era regulations aimed at protecting coal miners from particles in diesel exhaust.

23.   The Bush administration is putting in place rules proposed by President Clinton to protect miners from diesel exhaust.

24.   The other group was exposed to the allergen and a whiff of diesel exhaust.

25.   The pollution was blamed on high levels of nitrogen dioxide and respirable particulates from diesel exhausts, and a lack of wind to blow them away.