Manufacturing Greenhouse Gas Emissions Statistics 2026

Key manufacturing emissions statistics

EPA's national inventory is the best source for total U.S. emissions. EPA's GHGRP is the best source for large facility-level emitters. Those are different tools. The inventory estimates the full economy, while GHGRP captures large reporting facilities and suppliers. That distinction matters because a small fabrication shop, cabinet plant, or job shop may not appear in GHGRP at all, while a refinery, cement plant, steel mill, or chemical complex usually does.

For link and citation work, the headline number is this: NAICS 31-33 manufacturing facilities reported 650.6M metric tons CO2e of direct emissions in EPA's 2023 GHGRP facility file. That equals 25.2% of the 2,578,000,000 metric tons CO2e reported by all GHGRP direct emitters. The average reporting manufacturing facility in the filtered file emitted 284,104 metric tons CO2e, but the average hides the shape of the market. A few very large process plants carry a large share of the total.

What counts as manufacturing greenhouse gas emissions?

Manufacturing emissions usually show up in three buckets. The first bucket is fuel burned on site for heat, steam, boilers, furnaces, kilns, dryers, ovens, turbines, and other equipment. EPA says most direct industry emissions come from fossil fuel consumption for energy, and ENERGY STAR says on-site fossil fuel use typically contributes 60% to 70% of manufacturing energy-related CO2 emissions.

The second bucket is process emissions. These come from chemical reactions that happen because of the product itself. Cement calcination, steelmaking, hydrogen production, ammonia production, nitric acid production, lime production, aluminum smelting, and fluorinated gas production all fall into this category. EPA describes those direct emissions as coming from chemical reactions during the production of chemicals, metals, and minerals.

The third bucket is electricity. A plant may not emit at the smokestack when it buys power from the grid, but that electricity still has upstream emissions. That's why EPA reports industry both ways: 23% of total U.S. emissions as direct industry emissions, and 30% when indirect electricity emissions are allocated to the industry sector.

Manufacturing emissions by state

The EPA facility file shows that manufacturing emissions are not spread evenly across the map. Texas manufacturing facilities reported 143.6M metric tons CO2e, which was 22.1% of the NAICS 31-33 manufacturing total in this dataset. The top five states, Texas, Louisiana, Indiana, California, and Ohio, accounted for 53.4% of reported manufacturing direct emissions.

That concentration makes sense. Texas and Louisiana have large petroleum refining and petrochemical corridors. Indiana and Ohio have steel, metals, chemicals, glass, and heavy industrial assets. California combines refining, cement, chemicals, food processing, and electronics. A state with a large number of smaller factories can still rank below a state with fewer but heavier process facilities.

Manufacturing emissions by process

Facility totals are useful, but process totals explain why some industries are hard to decarbonize. Cement kilns, refineries, hydrogen units, blast furnaces, ammonia plants, lime kilns, petrochemical units, and nitric acid plants often emit because heat and chemistry are built into the production route.

In the EPA GHGRP manufacturing subset, cement production reported 65.5M metric tons CO2e across 90 facilities. Petroleum refining reported 45.5M metric tons CO2e across 129 facilities. Hydrogen production reported 42.9M metric tons CO2e across 110 facilities. Together, the five largest process categories in the table below represented 30.4% of total reported manufacturing direct emissions in the filtered file.

This is why factory emissions work can't be managed with one generic playbook. A discrete manufacturer can often start with compressed air, motors, lighting, HVAC, heat recovery, scheduling, and purchased power. A cement plant, refinery, ammonia plant, or steel mill needs deeper process changes, fuel changes, carbon capture, feedstock changes, or new production routes. The sales message, capital plan, and engineering roadmap are different.

Largest reported manufacturing emitters

The table below is not a list of every manufacturer with emissions. It is a ranked slice of large direct emitters in EPA's GHGRP file that have manufacturing NAICS codes. The largest individual sites are mostly refineries, chemical plants, steel mills, nitrogen facilities, and integrated process complexes.

For context, EPA says 7,544 facilities reported direct emissions to GHGRP for reporting year 2023. In the filtered manufacturing file, the largest site, ExxonMobil's Baytown operation, reported 12.7 million metric tons CO2e. The twentieth site in this ranked cut, WRB's Wood River Refinery, reported 4.2 million metric tons CO2e. Those single-site numbers are larger than many manufacturers' entire supplier networks.

What the numbers mean for manufacturers and industrial marketers

These statistics are useful because emissions are a buying signal. A high-emitting process plant is more likely to care about heat integration, burner controls, waste heat recovery, process analytics, instrumentation, refractory work, emissions monitoring, power procurement, reliability, and capital planning. A smaller machining or assembly operation may care more about utility bills, compressed air leaks, coolant management, scrap, HVAC, motors, lighting, and supplier questionnaires.

There is also a sales-cycle reality here. Plants with the largest emissions usually have the largest internal review process. They may require corporate engineering, environmental health and safety, procurement, finance, plant operations, and legal review before a project moves. When you're marketing to those buyers, vague sustainability language does not help. Name the process, name the constraint, and show the operational payoff.

EIA's 2022 MECS release is a good reminder that the middle of the market is still early. EIA says more than 40% of manufacturing establishments participated in general energy management activities. That leaves a lot of plants that either are not formalizing energy management yet or are doing it in a narrow way. For suppliers, that creates two different offers: one for heavy process plants with capital projects, and one for smaller manufacturers that need practical energy and operations improvements.

How to use this data

Use EPA GHGRP data when you need a facility-level view of large direct emitters. Use EPA's national inventory when you need total U.S. emissions by sector. Use EIA MECS when you need energy consumption, fuel mix, energy management, and establishment-level energy behavior across manufacturing. Use ENERGY STAR when you need practical language around industrial source categories and reduction levers.

If you're writing for backlinks, the most citable facts are the concentrated ones: Texas manufacturing direct emitters reported 143.6M metric tons CO2e, cement production reported 65.5M metric tons CO2e, and the top five process categories represented 30.4% of the manufacturing GHGRP total. Those numbers are specific enough for journalists, consultants, economic development teams, and industry writers to cite.