Question

what did the 1970 revision of the clean air act establish for the critical pollutants? no legal limits on pollution specific disposal locations removed all fines on polluters

Explanation:

The 1970 Clean Air Act revision established ambient air quality standards for critical pollutants. The other options are incorrect: "no legal limits on pollution" goes against the act's purpose, "specific disposal locations" is not related to the act's focus on air pollutants, and "removed all fines on polluters" is not what the act did (it aimed to regulate pollution, not reduce penalties).

Answer:

(Assuming the last option, though partially cut, is "ambient air quality standards") The correct option (the last one, likely "ambient air quality standards") as the 1970 Clean Air Act revision established ambient air quality standards for critical pollutants. The other options are incorrect: "no legal limits on pollution" is wrong (the act set limits), "specific disposal locations" is irrelevant to air pollutant regulation, and "removed all fines on polluters" is incorrect (the act sought to regulate pollution, not eliminate penalties).