The ________ of 1990 established national emission standards for more than 188 different air pollutants.
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Q84: Ozone in the upper atmosphere provides a
Q85: The colorless,odorless radioactive gas that is the
Q86: An ecological _ is a resource management
Q87: The approach to urban planning that concentrates
Q88: One of the hazardous components of air
Q90: The Environmental Protection Agency has specific regulations
Q91: Forests that have flourished for several hundred
Q92: The conversion of wetlands,grasslands,and forests for agriculture,urban
Q93: The removal of trees from a forested
Q94: Many population analysts argue that _,the maximum
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