1.   Crawford is one of the founders of the International Dark-Sky Association, which lobbies governments to adopt pollution standards.

2.   The water authorities thus not only set and enforce pollution standards, they are major polluters themselves.

3.   The German cars meet pollution standards that are tougher than those of the EC.

4.   A US study has concluded that tiny airborne particles from car exhausts may cause disease and death even at levels that meet air pollution standards.

5.   And, regulators may come under pressure to tighten pollution standards to protect the small fraction of the population that is most sensitive to a particular substance.

6.   As a result, pollution standards are strict.

7.   Birmingham is in violation of federal air pollution standards for smog.

8.   A new coalition of Massachusetts businesses is fighting proposed federal rules that would tighten pollution standards on smog and airborne particles.

9.   Above all, what the EPA ruling will do is raise the bar for meeting air pollution standards to a qualitatively higher level.

10.   Also, many areas also have different pollution standards, so travelers may encounter pollutants and irritants that could set off asthma attacks or allergic reactions, he said.