1.   But the rules are being challenged by Europe.

2.   And employers said they would probably challenge the rules in court.

3.   And it would provide new grounds for businesses to challenge the rules in court.

4.   As of now, neither parts makers nor auto makers plan to challenge the rule, with both sides saying the EPA had found a middle ground.

5.   At every step, the tighter soot rules have been challenged by industry groups, which have criticized the underlying science.

6.   At first, Ota aggressively challenged the rule.

7.   Automakers challenged that rule in court on three occasions and lost each time.

8.   Board members have challenged the rule, which is awaiting an attorney general opinion.

9.   A few years ago, there was talk of Ohio State linebacker Andy Katzenmoyer challenging the rule so he could enter the NFL after his sophomore season in college.

10.   A spokesman for diesel engine manufacturer Cummins Inc. of Columbus, Ind., which joined in challenging the rule, said it was reviewing the decision.