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Anonymous Posted 16 years ago
Grammar

Confused

Air pollution in the city had reached four times the acceptable levels.

Does it mean better or worse?
  

Top answer

It means worse. It's measured in terms of the percentage of pollutants present (parts per million, or some such scale). Let's say the acceptable amount of a particular pollutant is 50 ppm.

— Avangi

  • It means worse.
  • It's measured in terms of the percentage of pollutants present (parts per million, or some such scale).
  • Let's say the acceptable amount of a particular pollutant is 50 ppm.
  • Four times this would be 200 ppm.
  • When we say it's reached this point, we mean it has been climbing.
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2 Answers
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It means worse.

It's measured in terms of the percentage of pollutants present (parts per million, or some such scale).
Let's say the acceptable amount of a particular pollutant is 50 ppm. Four times this would be 200 ppm.

When we say it's reached this point, we mean it has been climbing. The more polution, the higher the number, and the worse the conditions for the
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