ENVIRONMENT

AIR QUALITY

Air quality compliance and improvement activities are key to U. S. Steel's environmental stewardship efforts.

U. S. Steel is continuously working to achieve environmental progress. This means that we strive for 100% compliance with all federal, state, and local agencies’ regulations to protect air quality.

This includes Title V operating permits required by the Clean Air Act in the United States and European Union governing bodies in the Slovak Republic. We meet rules and regulations surrounding:

  • Monitoring, recordkeeping, and reporting
  • Emissions limits and standards
  • Work Practices
  • Pollution Control Equipment
  • Stack testing

Nitrogen Oxides Air Goal

2021

In 2021, U. S. Steel will set a goal for nitrogen oxides (NOx) emission reduction from our facilities. We are evaluating our data to establish a baseline year and a reduction goal over a specific time period.


2019 Air Emissions
NOx

19.6

thousand metric tonnes

2019 Air Emissions
SO2

14.3

thousand metric tonnes


2020 Air Emissions
NOx

17.1

thousand metric tonnes

2020 Air Emissions
SO2

8.7

thousand metric tonnes

SPOTLIGHT: EMISSIONS CONTROL PROJECTS


CLAIRTON PLANT

VCU UPGRADE TO REDUCE
SO2 EMISSIONS

An innovative upgrade was made to the Vacuum Carbonate Unit (VCU), a key part of our Clairton Plant’s coke oven gas (COG) desulfurization process. The goal: reduce the concentration of hydrogen sulfide (H2S) in the COG in order to decrease sulfur dioxide (SO2) emissions produced when the COG is recycled and used for fuel at three Pittsburgh-area Mon Valley Works facilities (Clairton, Edgar Thomson and Irvin Plants). Within the VCU, the COG passes through a soda ash solution in a trayed absorber column. The H2S is absorbed by the soda ash, and the desulfurized gas exits the absorber column as a desulfurized fuel. Since completion in 2016, the upgrades have led to significant, measurable reductions in sulfur content in COG.


U. S. STEEL KOŠICE

A LONG-TERM COMMITMENT
TO EMISSIONS REDUCTION

Since acquiring U. S. Steel Košice (USSK) in 2001, U. S. Steel has made significant investments to improve the facility’s environmental performance. Thanks to those investments and the efforts of our employees, including the development of innovative environmentally focused solutions, specific solid particulate air emissions have decreased by 93% compared with 2001, down to 0.297 metric tons per 1,000 metric tons of steel produced. That equates to a 15,600 metric ton reduction in solid particulate air emissions in the vicinity of USSK since 2001.

ENVIRONMENTAL AREAS OF FOCUS

U. S. Steel’s current environmental areas of focus align with the results of our ESG Materiality Assessment.