U.S. Alumina and Aluminum Production and Processing (NAICS 3313): Investor Primer

1. Overview

North American Industry Classification System (NAICS) code 3313 is the four-digit industry group that covers the whole domestic business of turning aluminum into usable industrial forms — refining ore into alumina and smelting it into primary metal, melting scrap back into alloy, and rolling, extruding and drawing the metal into sheet, plate, foil, bars, profiles, tube and wire.[1]

For an investor the essential fact about this level is structural: NAICS 3313 contains exactly one child industry, the five-digit NAICS 33131, which carries the identical name and the identical scope. At this level the industry group and its single child are the same thing. This page therefore stays short — it states what the level is, gives our ground-truth federal figures for it, and points you to the full 33131 primer for everything else (economics, company-by-company detail, tickers, regulation and outlook).

The one substantive thing to know before you go there: in the United States this is overwhelmingly a processing and recycling business, not a primary-production one. Making metal from ore accounts for about 6% of the level's employees, while flat-rolling and extruding together carry roughly 84% of employees and 82% of payroll.[2] The physical flows agree — the country produced 660,000 metric tons of primary aluminum in 2025 against 1.31 million tons of smelter nameplate capacity, recovered an estimated 3.6 million tons from purchased scrap, and imported 60% of apparent consumption.[5]

2. What's inside — and why the level equals its one child

NAICS numbering nests: each four-digit industry group divides into one or more five-digit industries, which in turn divide into six-digit national industries. NAICS 3313 is a rare case where the four-digit group has only one five-digit child. That child, 33131, then splits into four six-digit industries that do the actual work. Their shares of the level (establishments / employees / payroll) are:[2]

• 331313 Alumina refining and primary aluminum production — 7% / 6% / 8%. The smallest domestic footprint and the only true commodity price-taker; three companies own the six remaining U.S. smelters and a single privately held refinery operates.[5]
• 331314 Secondary smelting and alloying of aluminum (recycling) — 21% / 10% / 10%. Many smaller, scrap-driven plants; growing, with the Federal Reserve's real-output index for the industry at 108.6 in 2025 against 93.0 in 2024 (2017 = 100).[17]
• 331315 Aluminum sheet, plate and foil manufacturing — 19% / 31% / 40%. Few, very large, capital- and skill-intensive mills; the highest wages in the level.
• 331318 Other aluminum rolling, drawing and extruding — 53% / 52% / 42%. The most numerous and most labor-heavy piece, and the softest right now: North American extrusion demand fell 3.1% in 2025.[39]

Because 33131 is the only child, every establishment, employee, dollar of payroll and dollar of receipts in NAICS 3313 is also in NAICS 33131 — the two levels are numerically identical. The real diversity sits one level down, and it is sharp. Payroll per employee runs roughly $98,000 in sheet, plate and foil and $95,000 in primary, against about $78,000 in recycling and $61,000 in extrusion — a direct read on where capital and skill concentrate.[2] Ownership widens as you move downstream, from a near-oligopoly of three upstream owners to fragmented fields of listed strategics, private-equity platforms and family firms in recycling and extrusion. And the four are not in the same place in the cycle: recycling output is rising while extrusion demand is falling.[17][39] For that full breakdown — who owns what, where value concentrates, and how to invest in each piece — read the 33131 primer.

Two sourcing cautions carry up from below. Census suppression is pervasive at the six-digit level: the child primers report no unsuppressed six-digit figure for receipts, firm count or concentration for any of the four industries, so the level's Economic Census figures in §3 cannot be checked against a published child breakdown, and the 331313 employment split above is an allocation from the level extract rather than an independently published industry figure.[2] Separately, some industry writing still calls aluminum extruders NAICS 331316, the pre-2022 code; under the 2022 manual used here the extrusion industry is 331318.[1]

3. Size (this level's rollup figures)

The figures below are our ground-truth federal statistics for NAICS 3313. Because the group equals its single child, they match the 33131 rollup exactly.

The four six-digit records sum cleanly to this level — 32 + 92 + 80 + 227 = 431 establishments and 3,583 + 5,746 + 18,025 + 30,004 = 57,358 employees — so the rollup is internally consistent rather than an approximation.[2]

What the concentration figures mean. With 257 firms across 431 establishments, the average operator runs more than one plant, and the top 50 firms account for 85% of receipts. The level's HHI of 500.4 is low — below the roughly 1,500 mark that U.S. antitrust agencies treat as the start of "moderate" concentration — and the top four firms hold only about 38% of receipts, so no single firm dominates the level as a whole. That aggregate badly understates reality inside the four six-digit markets, which rarely compete head-to-head, and the revised child work now puts numbers on the gap: three companies own the six remaining U.S. smelters;[5] seven producers told the U.S. International Trade Commission (USITC) they accounted for 91.4% of U.S. common-alloy sheet production in 2023;[20] while extrusion runs the other way, with at least 29 known domestic producers, more than 510 presses operating across North America, and a leader — Norsk Hydro — estimating only an 18% North American share.[21][24][12] The level looks unconcentrated precisely because it bundles separately structured markets. See the 33131 primer for that nuance.

Product-market size measures do not add up to the level. The children carry three differently scoped figures that are useful individually and misleading if combined: the U.S. Geological Survey (USGS) valued 2025 domestic primary aluminum output at about $2.6 billion; the USITC put apparent U.S. consumption of aluminum extrusions at roughly 2.4 million short tons worth $14.9 billion, of which domestic producers supplied 1.3 million short tons worth $8.0 billion (53.4% by quantity); and USGS put secondary recovery from purchased scrap at 3.6 million tons.[5][21] These rest on commodity accounting, customs definitions and NAICS boundaries respectively, and they overlap. Only the $51.142 billion Economic Census receipts figure is a level total.

Undercount and double-count caveats. County Business Patterns (CBP) counts only establishments with paid employees, omitting nonemployer and government operations; for a capital-intensive level like this the omission is minor. Two boundary effects matter more. Vertically integrated plants are classified by primary activity, so an integrated recycle-and-roll mill lands in the sheet industry rather than the recycling one — the largest single statistical undercount in the level, since USGS scrap-recovery totals include captive recycling inside rolling and extrusion mills. Scrap wholesaling without smelting (423930), commingled-material sorting (562920) and aluminum foundries (331524) sit outside the level entirely.[1] And the $51 billion receipts figure double-counts metal that flows from one stage to the next and is inflated by the aluminum price that passes through every invoice — it is gross revenue, not economic output, so do not read it as value added. Note also that receipts are 2022 while employment and payroll are 2023.

4. Investable universe (where value concentrates)

There is no pure play for NAICS 3313 as a whole, and — because the group equals its one child — no pure play for 33131 either. Value concentrates unevenly across the four six-digit industries below the level, and that is where the investable names sit:

• Sheet, plate and foil (331315) and extrusion (331318) hold most of the listed value: specialists such as Kaiser Aluminum (Nasdaq: KALU) and Constellium (NYSE: CSTM) in flat-rolled products, and Tredegar (NYSE: TG) as the most direct listed extrusion exposure — its Bonnell Aluminum business was 86% of 2025 consolidated net sales. Steel Dynamics (Nasdaq: STLD) is the large new entrant in sheet, though aluminum was only 2% of its consolidated 2025 sales. Foreign strategics (Novelis/Hindalco, Gränges, UACJ) and private-equity owners (Apollo-managed funds at Arconic, American Industrial Partners at Commonwealth Rolled Products) hold much of the rest.[7][9][11][10][14][27][28]
• Primary and alumina (331313) offers the most direct commodity exposure but the smallest domestic base — Alcoa (NYSE: AA) and Century Aluminum (Nasdaq: CENX). Century is the closer proxy for domestic smelter economics but carries a real counterparty concentration: Glencore owned 36.4% of it at year-end 2025 and accounted for roughly 54% of consolidated sales. The private side upstream has narrowed to three named situations rather than a market — the Gramercy, Louisiana refinery (Atlantic Alumina, the only operating U.S. alumina refinery, with a $450 million U.S. government partnership announced in early 2026), the announced restart of one potline at the idled New Madrid, Missouri smelter, and Century's conditional 40% interest in a 750,000-ton greenfield smelter at Inola, Oklahoma.[6][25][26]
• Recycling (331314) has no listed pure play; exposure comes through diversified strategics such as Rio Tinto (NYSE: RIO), which bought half of the Matalco network for $700 million, and Norsk Hydro (Oslo: NHY), plus large private and family recyclers and a foreign state-backed buyer — Emirates Global Aluminium took 80% of Spectro Alloys.[13][12][16]

Diversified metals or materials exchange-traded funds (ETFs) give only diluted exposure. Private investors find the deepest opportunity set in the fragmented recycling and extrusion industries; rolling mills rarely change hands because replacement cost is enormous. The full name-by-name map — public specialists, foreign strategics, private-equity platforms and family owners — is in the 33131 primer, §4.

5. How the money works

Across the level the selling price has one shape:

London Metal Exchange (LME) aluminum price + regional metal premium + conversion premium.

The metal component is largely passed through to customers, so headline revenue tracks the aluminum price and is a poor measure of economic output. What the business actually earns is the conversion premium — the value added by refining, smelting, alloying, rolling, extruding, heat-treating, coating and finishing. Kaiser's 2025 is the cleanest illustration in the children: net sales rose to $3.37 billion even though shipments fell 5%, because the hedged cost of alloyed metal rose 29% and was passed through, while conversion revenue — the number that measures the mill's actual work — was essentially flat at $1.45 billion.[8] Compare operators on conversion revenue and margin per ton, utilization and metal yield, and product mix — not on sales.

Primary smelting is the exception that proves the rule: it is a pure commodity with little conversion premium and enormous electricity needs, which is why high U.S. power costs have hollowed out domestic capacity. The scale is concrete — Century expects annual electricity use of 3,372,600 megawatt-hours at Sebree and 3,504,000 at Mt. Holly, so a $1-per-megawatt-hour move changes annual cost by roughly $3.4 million and $3.5 million. The upstream industry is also levered to a regional premium the others merely pay: Century's average realized Midwest premium rose to $1,295 per ton in 2025 from $427 in 2024, while its average LME price moved only from $2,419 to $2,630.[6] The three conversion industries are insulated by pass-through and earn on scrap access, utilization and mix. They also differ in how revenue is contracted — can sheet typically runs on long-term agreements, while 62.5% of reported 2022 domestic extrusion shipments were spot sales against 13.5% under long-term contracts, which is why extrusion earnings move faster with the cycle.[21] One genuine disagreement is worth flagging: two children put remelting at roughly 5% of the energy needed to make primary metal, citing Department of Energy material, while the recycling primer carries a USITC estimate of about 8%.[19][18] The direction is the same and the advantage is large either way; the precise figure depends on scope. See the 33131 primer, §5, for the full mechanics.

6. Demand drivers

End demand is common to the level. In 2025 the USGS put U.S. aluminum consumption at roughly transportation 36%, packaging 24%, building 13%, electrical 9%, consumer durables 8%, machinery 8% and other 2%; total North American demand rose 0.8% to about 26.65 billion pounds.[5][39] Packaging (beverage and food cans) is the most defensive market and also the cleanest source of recyclable scrap; transportation (autos, aerospace, trucks) is larger but cyclical; building and construction drives general-purpose extrusion hardest — construction was 61% of Tredegar's Bonnell extrusion sales in 2025 (54% nonresidential, 7% residential), which makes 331318 the most construction-sensitive piece of the level.[11]

A level-wide demand number hides that the children are in different places in the cycle. North American extrusion demand fell 3.1% in 2025 even as total aluminum demand edged up 0.8%, while the Federal Reserve's real-output index for secondary smelting and alloying jumped to 108.6 from 93.0.[39][17] Scrap availability is itself a growth constraint: old (post-consumer) scrap supplied only about 28% of apparent U.S. consumption in 2025, and the United States exported 2.2 million tons of aluminum scrap while importing 890,000 tons — and the binding constraint is quality as much as quantity, since residual copper and iron accumulate through repeated remelting and aerospace, electrical and some automotive specifications still require primary or very clean segregated scrap.[5] The child-by-child demand detail is in the 33131 primer, §6.

7. Regulation

Trade policy is the dominant regulatory force at this level. Since April 6, 2026, most covered aluminum has faced an additional 50% duty under Section 232 of the Trade Expansion Act, assessed on full customs value, with qualifying United Kingdom metal at 25%, Russian metal and products containing Russian-smelted or -cast aluminum at 200%, and specified derivative products at 25% or a temporary 15%.[30][31] A July 20, 2026 proclamation went further, letting approved investors in new or expanded U.S. primary capacity import a matching quantity of primary metal at half the otherwise-applicable rate — an explicit push to reshore domestic smelting. It does not cut duties on imported extrusions or sheet, but it can move domestic billet availability and premiums downstream.[32]

Trade remedies do not protect the four industries equally — a correction the revised children make plain. Antidumping and countervailing duty orders continue to apply to certain common-alloy sheet and foil imports, reinforcing the sheet industry's cover.[33] Extrusion got the opposite outcome: the broad 2024 case covering imports from 14 trading partners ended without new orders after the USITC found no material injury or threat, even though Commerce made affirmative dumping and subsidy findings; earlier orders on certain Chinese extrusions remain in force separately.[23] Do not assume "aluminum tariffs" mean the same thing for every child. Beyond trade, operators face Environmental Protection Agency (EPA) aluminum-forming effluent guidelines and the National Emission Standards for Hazardous Air Pollutants (NESHAP) for secondary aluminum, while the upstream industry carries an extra layer — separate NESHAP requirements for potlines, pitch storage, paste production and anode-bake furnaces, plus bauxite-residue ("red mud") management, for which EPA notes no approved secondary use in the United States — and Occupational Safety and Health Administration (OSHA) rules for molten metal, hazardous energy and combustible aluminum dust.[34][35][36][37][38] Full detail is in the 33131 primer, §7.

8. Consolidation

The level is consolidating selectively, and most of the buying is by strategic and private-equity owners rather than through public markets — Rio Tinto taking 50% of Matalco for $700 million and Emirates Global Aluminium 80% of Spectro Alloys in recycling; Apollo-managed funds acquiring Arconic in 2023 at an announced enterprise value of about $5.2 billion and American Industrial Partners taking the Lewisport mill, now Commonwealth Rolled Products, in rolling; and private-equity platforms rolling up regional extruders, such as Wynnchurch's Astro Shapes acquiring Star Extruded Shapes.[13][16][27][28][29] Upstream, consolidation is effectively blocked by antitrust and the tiny asset count, so the action is exits and restarts: Century's idled Hawesville smelter was sold in February 2026 for $200 million plus a 6.8% interest in the buyer's planned data-center project and will not return as a smelter — a reminder that the scarce upstream input is now electricity, contested by a better-paying buyer.[6]

The next competitive question is new sheet capacity: Steel Dynamics' 650,000-tonne Mississippi mill began commercial shipments in the second half of 2025, and Novelis' 600,000-tonne, roughly $5 billion Bay Minette, Alabama project — the first fully integrated U.S. aluminum mill in more than 40 years — was scheduled to begin commissioning in the second half of 2026. Together that is about 1.25 million tonnes that must find customers and pass qualifications.[10][14] Foreign strategic ownership is pervasive — Hindalco (Novelis), Norsk Hydro, UACJ, Gränges, Rio Tinto and Emirates Global Aluminium all own material U.S. assets — which is why much of the industry is not visible on a U.S. stock screen. See the 33131 primer, §8.

9. Risks

The level's risks are those of its one child, and the revised work sharpens several of them: cyclicality, with the construction-heavy, spot-priced extrusion industry most exposed — product-market utilization fell from 83.5% in 2021 to 70.1% in 2023 and 67.7% in early 2024;[22] a wave of roughly 1.25 million tonnes of new sheet supply that could pressure conversion premiums during ramp-up;[10][14] high U.S. energy costs that keep primary smelting uncompetitive, with power increasingly contested by data centers;[6] metal-price pass-through timing that inflates working capital when prices rise;[8] trade-policy reversal, and protection that is not granted uniformly across the children;[23][32] operational outages — fires at Novelis' Oswego plant left fiscal-2026 rolled shipments 145,000 tonnes below expectation and cut adjusted EBITDA by an estimated $104 million;[15] intra-level substitution, since better scrap sorting is a tailwind for recycling and a structural headwind for primary;[5][19] customer and counterparty concentration, including Century's 36.4% Glencore ownership and 54% sales dependence and a single operating alumina refinery as a national single point of failure;[6][5] and environmental and legacy liabilities at older sites, from bauxite residue upstream to anodizing, coating and remelt residues downstream.[37][35] Each is developed, industry by industry, in the 33131 primer, §9.

10. How to invest and outlook

Because NAICS 3313 equals its single child 33131, the how-to-invest thesis is identical — treat this page as a signpost and use the 33131 primer for execution. In brief: value concentrates in the conversion industries, so the most direct listed exposures are Kaiser Aluminum (KALU) and Constellium (CSTM) in sheet and plate and Tredegar (TG) in extrusion, with Steel Dynamics (STLD) as the large new entrant, Alcoa (AA) and Century Aluminum (CENX) as the upstream-commodity plays, and Norsk Hydro (NHY), Rio Tinto (RIO), Hindalco, Gränges and UACJ as diversified or foreign routes; there is no pure play for the level.[7][9][11][10][6][12] Compare companies on conversion revenue and margin per ton, utilization and yield, mix, scrap access and enterprise value against normalized conversion earnings — not on headline sales, which are distorted by metal pass-through; Kaiser's $3.37 billion of 2025 sales against $1.45 billion of conversion revenue is the canonical illustration.[8] Upstream, value on mid-cycle earnings rather than peak metal prices or premiums. Private capital finds the deepest opportunity set in the fragmented recycling and extrusion industries; upstream the private menu is now three named situations, not a market.

The demand backdrop is favorable but the supply picture is tightening, and the four six-digit industries point in more different directions than the previous read suggested. Recycling is the most structurally advantaged, with real output up materially in 2025;[17] sheet has strong tariff cover but faces the new capacity now commissioning and qualifying;[10][14] extrusion is the near-term weak spot — demand down 3.1%, presses running around two-thirds utilized, mostly spot-priced, and no new protection from its 2024 trade case;[39][22][21][23] and primary remains the wildcard, structurally uncompetitive on power but now the target of reshoring policy with money attached, against the counterexample of Hawesville leaving the industry for a data center.[25][6] The durable winners across all four share the same traits — secured scrap and billet supply, competitive long-term power, high utilization, differentiated value-added mix and disciplined working capital. For the complete outlook, see the 33131 primer, §10.

Sources

1. U.S. Census Bureau, 2022 North American Industry Classification System Manual, 2022. https://www.census.gov/naics/reference_files_tools/2022_NAICS_Manual.pdf
2. U.S. Census Bureau, County Business Patterns: 2023 (NAICS 3313 / 33131 and six-digit establishment, employment and payroll records), 2025. https://www.census.gov/data/datasets/2023/econ/cbp/2023-cbp.html
3. U.S. Census Bureau, 2022 Economic Census — Concentration Ratios and Share of Largest Firms (receipts, firm count, CR4/CR8/CR20/CR50, HHI for NAICS 33131), 2025. https://www.census.gov/programs-surveys/economic-census/data/tables.html
4. U.S. Small Business Administration, Table of Small Business Size Standards, 2023. https://www.sba.gov/document/support-table-size-standards
5. U.S. Geological Survey, Mineral Commodity Summaries 2026 — Aluminum, 2026. https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-aluminum.pdf
6. Century Aluminum Company, 2025 Form 10-K, 2026. https://www.sec.gov/Archives/edgar/data/949157/000162828026013788/cenx-20251231.htm
7. Kaiser Aluminum Corporation, 2025 Form 10-K, 2026. https://www.sec.gov/Archives/edgar/data/811596/000119312526059575/kalu-20251231.htm
8. Kaiser Aluminum Corporation, Fourth-Quarter and Full-Year 2025 Results, 2026. https://www.sec.gov/Archives/edgar/data/811596/000119312526057221/kalu-ex99_1.htm
9. Constellium SE, 2025 Annual Report, 2026. https://www.sec.gov/Archives/edgar/data/1563411/000156341126000147/a2025ars.htm
10. Steel Dynamics, 2025 Form 10-K, 2026. https://www.sec.gov/Archives/edgar/data/1022671/000110465926021395/stld-20251231x10k.htm
11. Tredegar Corporation, 2025 Form 10-K, 2026. https://www.sec.gov/Archives/edgar/data/850429/000162828026016665/tg-20251231.htm
12. Norsk Hydro ASA, Integrated Annual Report 2025, 2026. https://www.hydro.com/globalassets/06-investors/reports-and-presentations/annual-report/ar-2025/integrated-annual-report-2025.pdf
13. Rio Tinto, Rio Tinto and Giampaolo Group Complete Matalco Aluminium Recycling Transaction, 2023. https://www.riotinto.com/en/can/news/releases/2023/rio-tinto-and-giampaolo-group-complete-matalco-aluminium-recycling-transaction
14. Novelis Inc., Fiscal 2026 Form 10-K, 2026. https://www.sec.gov/Archives/edgar/data/1304280/000130428026000019/nvl-20260331.htm
15. Novelis Inc., Fourth Quarter and Full Fiscal Year 2026 Results, 2026. https://investors.novelis.com/news-events/press-releases/detail/1420/novelis-reports-fourth-quarter-and-full-fiscal-year-2026-results
16. Emirates Global Aluminium, EGA Completes Acquisition of Majority Stake in Spectro Alloys, 2024. https://media.ega.ae/ega-completes-acquisition-of-majority-stake-in-us-recycling-firm-spectro-alloys/
17. Federal Reserve Bank of St. Louis, Industrial Production: Secondary Smelting and Alloying of Aluminum (NAICS 331314), 2026. https://fred.stlouisfed.org/series/IPN331314A
18. U.S. International Trade Commission, Aluminum: Competitive Conditions Affecting the U.S. Industry, 2017. https://www.usitc.gov/sites/default/files/publications/332/pub4703.pdf
19. U.S. Department of Energy, Alcoa Aluminum Recycling Facility, Better Buildings Solution Center. https://betterbuildingssolutioncenter.energy.gov/showcase-projects/alcoa-aluminum-recycling-facility
20. U.S. International Trade Commission, Common Alloy Aluminum Sheet from Bahrain, Brazil, Croatia, Egypt, Germany, Greece, India, Indonesia, Italy, Oman, Romania, Serbia, Slovenia, South Africa, South Korea, Spain, Taiwan, and Turkey, Publication 5538, 2024. https://www.usitc.gov/sites/default/files/publications/701_731/pub5538.pdf
21. U.S. International Trade Commission, Aluminum Extrusions from China and 13 Other Countries, Publication 5477, 2024. https://www.usitc.gov/publications/701_731/pub5477.pdf
22. U.S. International Trade Commission, Aluminum Extrusions from China and Other Countries, Publication 5560, 2024. https://www.usitc.gov/sites/default/files/publications/701_731/pub5560.pdf
23. U.S. International Trade Commission, Aluminum Extrusions from 14 Countries Do Not Injure U.S. Industry, 2024. https://www.usitc.gov/press_room/news_release/2024/er1030_66075.htm
24. Aluminum Extruders Council, Domestic Supply, 2026. https://aec.org/domestic-supply
25. Business Wire, Atlantic Alumina Announces $450 Million Strategic Partnership with United States Government, 2026. https://www.businesswire.com/news/home/20260111484503/en/Atlantic-Alumina-Announces-%24450-Million-Strategic-Partnership-with-United-States-Government
26. Mining Weekly (Reuters), Aluminium Supply Shock Revives Long-Idled Western Smelters, 2026. https://www.miningweekly.com/article/aluminium-supply-shock-revives-long-idled-western-smelters-reuters-says-2026-07-10
27. Arconic, Arconic to Be Acquired by Apollo Funds, 2023. https://www.arconic.com/-/arconic-to-be-acquired-by-apollo-funds
28. American Industrial Partners, Aleris Lewisport Facility Is Now Commonwealth Rolled Products, 2020. https://americanindustrial.com/news/aleris-lewisport-ky-aluminum-facility-is-now-commonwealth-rolled-products/
29. Wynnchurch Capital, Astro Shapes Acquires Star Extruded Shapes, 2025. https://www.wynnchurch.com/news/astro-shapes-acquires-star-extruded-shapes
30. White House, Strengthening Actions Taken to Adjust Imports of Aluminum, Steel, and Copper Into the United States, 2026. https://www.whitehouse.gov/presidential-actions/2026/04/strengthening-actions-taken-to-adjust-imports-of-aluminum-steel-and-copper-into-the-united-states/
31. White House, Further Adjusting the Tariff Regimes for Imports of Aluminum, Steel, and Copper, 2026. https://www.whitehouse.gov/presidential-actions/2026/06/further-adjusting-the-tariff-regimes-for-imports-of-aluminum-steel-and-copper-into-the-united-states/
32. White House, Further Strengthening Actions Taken to Adjust Imports of Aluminum Into the United States, 2026. https://www.whitehouse.gov/presidential-actions/2026/07/further-strengthening-actions-taken-to-adjust-imports-of-aluminum-into-the-united-states/
33. U.S. International Trade Commission and International Trade Administration, Common Alloy Aluminum Sheet and Aluminum Foil Trade Remedies, 2021–2026. https://www.usitc.gov/press_room/news_release/2024/er0815_65768.htm
34. U.S. Environmental Protection Agency, Aluminum Forming Effluent Guidelines, 2026. https://www.epa.gov/eg/aluminum-forming-effluent-guidelines
35. U.S. Environmental Protection Agency, Secondary Aluminum Production: National Emission Standards for Hazardous Air Pollutants (40 CFR Part 63, Subpart RRR), 2026. https://www.epa.gov/stationary-sources-air-pollution/secondary-aluminum-production-national-emission-standards
36. U.S. Environmental Protection Agency, Primary Aluminum Reduction Industry National Emission Standards, 2025. https://www.epa.gov/stationary-sources-air-pollution/primary-aluminum-reduction-industry-national-emission-standards
37. U.S. Environmental Protection Agency, TENORM: Bauxite and Alumina Production Wastes, 2025. https://www.epa.gov/radiation/tenorm-bauxite-and-alumina-production-wastes
38. Occupational Safety and Health Administration, Combustible Dust, 2026. https://www.osha.gov/combustible-dust
39. Aluminum Association, North American Aluminum Demand Steady in 2025, 2026. https://www.aluminum.org/news/north-american-aluminum-demand-steady-2025