What are the criteria pollutants and the National Ambient Air Quality Standards, and how are the standards used?
What will be an ideal response?
The Clean Air Act required that the most widespread pollutants be identified, ambient standards—"levels that need to be achieved to protect environmental and human health"—be set, and "control methods and timetables to meet the standards" be established.
The six criteria pollutants that are covered by the National Ambient Air Quality Standards are carbon monoxide, nitric oxides, sulfur dioxide, particulates, ozone, and lead. The primary standards are quantities of the pollutants that can be found in air and are "based on the presumed highest level that can be tolerated by humans without noticeable ill effects, minus a 10% to 50% margin of safety."
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A) OPEC B) NAFTA C) EU D) ASEAN E) the United Nations
Both Erase and Eliminate can remove map features from a layer. Explain how the two commands differ in usage.
What will be an ideal response?
Taiwanese-owned ________ is the world's largest electronic components manufacturer, with 1.2 million workers in China
A) Apple B) IT-Deluxe C) Chongquing IT D) FoxConn
Use the following diagram to answer this question.
These may have been responsible for bringing water to Earth.
A. Comets only B. Comets and asteroids C. Asteroids only D. Neither comets nor asteroids