11.   But some historical evidence suggests that the excessive levels might have been abnormal, raising the issue of culpability.

12.   Drug-test results, called steroid profiles, resemble a pharmacological mountain range, with chemical peaks representing excessive levels of banned substances.

13.   El Paso has the worst air quality of any Texas city, with excessive levels of carbon monoxide, ground- level ozone and fine particles.

14.   Even breathing can add to the problem when carbon dioxide reaches excessive levels, creating stale air.

15.   For example, debt amassed by both individuals and corporations stands at excessive levels.

16.   Government inspectors later found that the workers were still finding excessive levels of black specks and metallic particles in some batches of Celestone.

17.   His research covered areas like coronary artery disease and hyperlipidemia of the blood, which is an excessive level of fatty substances like cholesterol.

18.   In recent years, the clean incoming water has been tainted by excessive levels of fecal bacteria in water coming from local sources.

19.   Now, some economists worry consumer debt has reached excessive levels.

20.   Still, with share prices so high, the payment for earnings certainty is reaching excessive levels, said Brown.