---
kind: "section"
citation: "40 C.F.R. § 98.193"
title: "40"
number: "98.193"
heading: "Calculating GHG emissions."
url: "https://uscodex.org/cfr/40/98.193"
---

# §98.193. Calculating GHG emissions.


You must calculate and report the annual process CO2 emissions from all lime kilns combined using the procedure in paragraphs [(a)](#a) and [(b)](#b) of this section.

- (a) If all lime kilns meet the conditions specified in § [98.33(b)(4)(ii)](/cfr/40/98.33.md?p=b-4-ii) or [(iii)](/cfr/40/98.33.md?p=b-4-iii), you must calculate and report under this subpart the combined process and combustion CO2 emissions from all lime kilns by operating and maintaining a CEMS to measure CO2 emissions according to the Tier 4 Calculation Methodology specified in [§ 98.33(a)(4)](/cfr/40/98.33.md?p=a-4) and all associated requirements for Tier 4 in [subpart C](/cfr/40/subpartC.md) of this part (General Stationary Fuel Combustion Sources).
- (b) If CEMS are not required to be used to determine CO2 emissions from all lime kilns under [paragraph (a)](#a) of this section, then you must calculate and report the process and combustion CO2 emissions from the lime kilns by using the procedures in either paragraph [(b)(1)](#b-1) or [(b)(2)](#b-2) of this section.
  - (1) Calculate and report under this subpart the combined process and combustion CO2 emissions from all lime kilns by operating and maintaining a CEMS to measure CO2 emissions from all lime kilns according to the Tier 4 Calculation Methodology specified in [§ 98.33(a)(4)](/cfr/40/98.33.md?p=a-4) and all associated requirements for Tier 4 in [subpart C](/cfr/40/subpartC.md) of this part (General Stationary Fuel Combustion Sources).
  - (2) Calculate and report process and combustion CO2 emissions from all lime kilns separately using the procedures specified in [paragraphs (b)(2)(i) through (viii)](#b-2-i..b-2-viii) of this section.
    - (i) You must calculate a monthly emission factor for each type of lime produced using Equation S-1 of this section. Calcium oxide and magnesium oxide content must be analyzed monthly for each lime product type that is produced:
    - (ii) You must calculate a monthly emission factor for each type of calcined byproduct or waste sold (including lime kiln dust) using Equation S-2 of this section:
    - (iii) You must calculate the annual CO2 emissions from each type of calcined byproduct or waste that is not sold (including lime kiln dust and scrubber sludge) using Equation S-3 of this section:
    - (iv) You must calculate annual CO2 process emissions for all lime kilns using Equation S-4 of this section:
    - (v) Calculate and report under [subpart C](/cfr/40/subpartC.md) of this part (General Stationary Fuel Combustion Sources) the combustion CO2 emissions from each lime kiln according to the applicable requirements in subpart C.
    - (vi) You must calculate an annual average emission factor for each type of lime product produced using Equation S-5 of this section.
    - (vii) You must calculate an annual average emission factor for each type of calcined byproduct/waste by lime type that is sold using Equation S-6 of this section.
    - (viii) You must calculate an annual average result of chemical composition analysis of each type of lime product produced and calcined byproduct/waste sold using Equations S-7 through S-10 of this section.

## Notes

### Amendments

[74 FR 56374, Oct. 30, 2009, as amended at 75 FR 66464, Oct. 28, 2010; 78 FR 71958, Nov. 29, 2013; 81 FR 89258, Dec. 9, 2016; 89 FR 31928, Apr. 25, 2024]

### Authority

Authority: 42 U.S.C. 7401-7671q.

### Source

Source: 74 FR 56374, Oct. 30, 2009, unless otherwise noted.

### Amendments

[74 FR 56374, Oct. 30, 2009, as amended at 75 FR 66464, Oct. 28, 2010; 78 FR 71958, Nov. 29, 2013; 81 FR 89258, Dec. 9, 2016; 89 FR 31928, Apr. 25, 2024]