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For the WMPT, exposure also depends on chemical generation and release.
The WMPT may include mass as a surrogate for exposure concentration, where P and B represent modifiers that reflect the way chemical characteristics affect exposure concentration.
Inspection of WMPT data reveals subfactor scores ranging from 10 to 1,000,000.
In the WMPT framework, subfactors assume values of 1 (low), 2 (medium), or 3 (high).
The chemicals with the lowest overall WMPT score (of 6) are designated as numeraire pollutants.
The risk-based levy approximates a fully informed charge when marginal damage is stable and pollution synergy does not render the proposed WMPT damage values ineffective.
In the following policy demonstration, the scoring results of the WMPT are supplemented by mass values in emission pounds.
For WMPT scoring groups (for example, 6-18), Table 4 provides the quantity of 1994 chemical releases, tax rate per emission pound, and estimated revenue.
Suppose a firm emits 2,000 emission pounds of mercury (WMPT chemical score of 18).
Tax authority could apply one rate per RU or progressive rates to each scoring group of the WMPT. The latter method would provide further incentive for risk reduction.
In the absence of site-specific estimation, the WMPT chemical scores imply a linear relationship between emissions and damage.
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