**Q553. For which units of measure are we required to calculate and report emissions using Equation W-3? May we use a flow meter to calculate annual emission CO2?**

**A553.** The units of measure for emissions calculated in Equation W-3 are in cubic feet per year. However, §98.233(d)(10) requires that the volumetric emissions of equation W-3 be converted into mass emissions using §98.233(v)’s methods. You must report emissions in metric tons of CO2e to meet the reporting requirements in §98.236(c)(3)(v). If reporters use the methodology set forth in §98.233(d)(2), then a vent flow meter must be used to determine the total annual volume of vent gas flowing out of the AGR unit.

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