Pollution taxes are preferred to direct controls because they don't require a way of measuring pollutants produced.

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Pollution taxes actually require a way of measuring pollutants produced, as they are based on the amount of pollution emitted by a particular entity. Direct controls, such as setting emission limits or requiring certain types of technology to be used, may not require as much measurement, but they can be more difficult to enforce and can be less flexible than pollution taxes.

Pollution Taxes Are Preferred to Direct Controls Because They Don't