Activity data uncertainties

National production statistics should be available and likely have an uncertainty of ± 10 percent. For Tier 2, the total amount of reducing agents and process materials used for lead production would likely be within 10 percent. Tier 3 requires plant-specific information on production data (about 5 percent uncertainty). In addition, actual emissions data for tier 3 would be expected to have ± 5 percent uncertainty.

Table 4.23 Uncertainty ranges


Data Source

Uncertainty Range

Tier 1

National Production Data Default Emission Factor Emission Factors by Process Type

i 10% i 50% i 20%

Tier 2

Amounts and Types of Reducing Agents Used Process Material Carbon Contents

i 10% i 15%

Tier 3

Facility-Derived = Process Materials Data Facility-Specific Measured CO2 Data Facility-Specific Emission Factors

i 5% i 5% i 5%

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