1.   Federal and California regulators are drafting new, tougher emissions regulations that may be hard for diesel engines to meet.

2.   He said the company has voluntarily certified its SUVs, pickups and vans to meet tougher federal emissions standards years before the standards take effect.

3.   Many in the auto industry worry that unilateral pollution reductions of the sort undertaken by Ford will only encourage regulators to set even tougher emissions standards.

4.   Mundy said that many cities that had not met their Federal goals for tougher emissions standards and might lose highway aid often looked to their airports for help.

5.   Ohio ranks third in production of greenhouse gases after California and Texas, and will face tougher emissions regulations if the treaty is ratified.

6.   The auto industry has traditionally resisted tougher emission standards, which can prove costly.

7.   The gas-to-liquids process creates a cleaner fuel than diesel created from crude oil, an important plus for refiners who face tougher emission standards worldwide.

8.   The tougher emissions inspections take efect in May in select counties.

9.   His bill, reworked on Friday, would suspend the tougher emissions test at all centralized stations.

10.   The pollution control department is preparing tougher emissions standards, to be effective in the next two or three years.