Biggest industrial CO₂ emitters in Canada

#	Facility	Type	Country	t CO₂e/yr
1	Algoma steel plant	Steel Plant	Canada	4,932,009
2	Irving Oil Saint John Refinery	Refinery	Canada	4,360,824
3	Cleveland-Cliffs Lake Erie steel plant	Steel Plant	Canada	3,642,472
4	ArcelorMittal Dofasco steel plant	Steel Plant	Canada	3,094,399
5	Nova Chemicals Corp. Joffree, Joffre,Alberta	Petrochemical	Canada	2,552,601
6	Valero Jean-Gaulin Refinery	Refinery	Canada	2,459,580
7	Nova Chemicals Corp. Corunna, Sarnia,Ontario	Petrochemical	Canada	2,099,079
8	Imperial Oil Strathcona Refinery	Refinery	Canada	1,955,920
9	Suncor Edmonton Refinery	Refinery	Canada	1,924,810
10	Suncor Montreal Refinery	Refinery	Canada	1,870,058
11	Redwater Fertilizer	Chemical Plant	Canada	1,837,394
12	Dow Chemical Co. Ft. , Fort Saskatchewan,Alberta	Petrochemical	Canada	1,827,497
13	Imperial Oil Sarnia Refinery	Refinery	Canada	1,625,111
14	Shell Scotford Refinery	Refinery	Canada	1,502,934
15	Medicine Hat Nitrogen Fertilizer Complex	Chemical Plant	Canada	1,489,602
16	Sept-Îles aluminium plant	Aluminium Smelter	Canada	1,338,837
17	Bowmanville Cement Plant	Cement Plant	Canada	1,337,509
18	Port Daniel Cement Plant	Cement Plant	Canada	1,275,488
19	Federated Co-operatives Limited Refinery Complex	Refinery	Canada	1,271,348
20	Imperial Oil Nanticoke Refinery	Refinery	Canada	1,118,169
21	Alma aluminium plant	Aluminium Smelter	Canada	1,020,066
22	ArcelorMittal Montreal steel plant	Steel Plant	Canada	933,302
23	Kitimat aluminium plant	Aluminium Smelter	Canada	924,435
24	Belle Plaine Nitrogenous Fertilizers	Chemical Plant	Canada	918,697
25	Exshaw Cement Plant	Cement Plant	Canada	901,178
26	Bécancour aluminium plant	Aluminium Smelter	Canada	877,682
27	Shell Corunna Refinery	Refinery	Canada	848,610
28	Suncor Sarnia Refinery	Refinery	Canada	848,610
29	St. Mary Cement Plant	Cement Plant	Canada	779,505
30	Brandon Fertilizer Facility	Chemical Plant	Canada	721,833
31	Carseland Nitrogen Operation	Chemical Plant	Canada	708,709
32	CAN-Division No. 1_methanol	Chemical Plant	Canada	688,860
33	Rio Tinto Fer et Titane steel plant	Steel Plant	Canada	673,836
34	Baie Comeau aluminium plant	Aluminium Smelter	Canada	667,293
35	Joffre Fertilizers	Chemical Plant	Canada	643,088
36	Deschambault aluminium plant	Aluminium Smelter	Canada	616,290
37	Saint Basile Cement Plant	Cement Plant	Canada	615,898
38	Heidelberg Delta Cement Plant 2	Cement Plant	Canada	615,883
39	Courtright Nitrogenous Fertilizers	Chemical Plant	Canada	595,316
40	Laterrière aluminium plant	Aluminium Smelter	Canada	552,536
41	Mississauga Cement Plant	Cement Plant	Canada	527,094
42	North West Redwater Partnership Sturgeon Refinery	Refinery	Canada	525,573
43	Grande Baie aluminium plant	Aluminium Smelter	Canada	501,533
44	Arvida aluminium plant	Aluminium Smelter	Canada	493,032
45	Bath Cement Plant	Cement Plant	Canada	450,824
46	Imperial Oil Products & Chemicals , Sarnia,Ontario	Petrochemical	Canada	438,077
47	Dundas Operations	Lime Plant	Canada	427,791
48	Usine De Bedford	Lime Plant	Canada	410,189
49	Beachville Operation	Lime Plant	Canada	382,459
50	Embro Cement Plant	Cement Plant	Canada	340,500
51	Picton Cement Plant	Cement Plant	Canada	328,310
52	Edmonton Cement Plant	Cement Plant	Canada	312,191
53	Parkland Burnaby Refinery	Refinery	Canada	294,352
54	Gibson Energy Moose Jaw Refinery	Refinery	Canada	290,040
55	Husky Lloydminster Refinery	Refinery	Canada	286,213
56	Joliette Cement Plant	Cement Plant	Canada	281,008
57	Saint Constant Cement Plant	Cement Plant	Canada	263,747
58	La Haute-Gaspésie Regional County Municipality	Aluminium Smelter	Canada	254,689
59	Fort Saskatchewan Nickel Cobalt Ore A-G Refinery	Chemical Plant	Canada	249,361
60	Usine De Marbleton	Lime Plant	Canada	183,830
61	Baymag Exshaw Operations	Other Manufacturing	Canada	173,462
62	Exshaw Plant	Lime Plant	Canada	168,836
63	Richmond Cement Plant	Cement Plant	Canada	154,647
64	Boyle Kraft Pulp Mill	Pulp & Paper Mill	Canada	150,530
65	Canada	Chemical Plant	Canada	145,755
66	Northern Lime Limited	Lime Plant	Canada	130,879
67	Mercer Celgar Limited - Mercer International Group	Pulp & Paper Mill	Canada	126,253
68	Evraz Regina Steel plant	Steel Plant	Canada	124,230
69	Meadow Lake Mechanical Pulp Mill	Pulp & Paper Mill	Canada	120,434
70	Glencore Canada Corporation - Fonderie Horne	Metals Plant	Canada	119,221
71	Faulkner Plant	Lime Plant	Canada	109,753
72	Kamloops Kraft Pulp Mill	Pulp & Paper Mill	Canada	109,194
73	Petro-Canada Mississauga Lubricants Refinery	Refinery	Canada	105,301
74	Paper Excellence Canada - Crofton Division	Pulp & Paper Mill	Canada	101,700
75	Nanaimo Forest Products Ltd - Harmac Pacific	Pulp & Paper Mill	Canada	101,700
76	Fonderie Horne	Metals Plant	Canada	99,418
77	Kruger Products - Kamloops Mill	Pulp & Paper Mill	Canada	99,059
78	Nanaimo Kraft Market Pulp Mill	Pulp & Paper Mill	Canada	97,686
79	Quesnel BCTMP Pulp Mill	Pulp & Paper Mill	Canada	97,116
80	Resolute Forest Products - St. Felicien Mill	Pulp & Paper Mill	Canada	95,545
81	Port Mellon Pulp Mill	Pulp & Paper Mill	Canada	95,009
82	Millar Western Pulp Ltd - Whitecourt Pulp Division	Pulp & Paper Mill	Canada	93,671
83	Saint John Kraft Pulp Mill	Pulp & Paper Mill	Canada	89,657
84	ROXUL Inc.	Other Manufacturing	Canada	87,162
85	CGC Hagersville Plant	Other Manufacturing	Canada	79,360
86	Tidewater Prince George Refinery	Refinery	Canada	78,836
87	Skookumchuck Softwood Bleach Kraft Pulp Mill	Pulp & Paper Mill	Canada	74,937
88	Gerdau Whitby Steel Mill	Steel Plant	Canada	72,303
89	Brampton Brick Limited	Other Manufacturing	Canada	70,941
90	Hinton Kraft Pulp Mill	Pulp & Paper Mill	Canada	66,908
91	Skookumchuk Pulp Mill	Pulp & Paper Mill	Canada	65,570
92	Slave Lake Bleached Chemi-Thermo-Mechanical Pulp Mill	Pulp & Paper Mill	Canada	64,232
93	Edmundston Pulp Mill	Pulp & Paper Mill	Canada	62,034
94	Havelock Plant	Lime Plant	Canada	61,953
95	Taylor Pulp Mill	Pulp & Paper Mill	Canada	61,555
96	Brampton Brick	Other Manufacturing	Canada	60,955
97	Pavilion Plant	Lime Plant	Canada	58,537
98	Langley Plant	Lime Plant	Canada	56,967
99	Revolution VSC LP	Metals Plant	Canada	50,951
100	Nackawic Kraft Pulp Mill	Pulp & Paper Mill	Canada	50,582
101	VSC	Metals Plant	Canada	48,766
102	Brookfield Cement Plant	Cement Plant	Canada	46,265
103	Usine De Joliette	Lime Plant	Canada	45,930
104	Atlantic Wallboard	Other Manufacturing	Canada	45,495
105	Ivaco Rolling Mills steel plant	Steel Plant	Canada	42,725
106	Atlantic Wallboard LP	Other Manufacturing	Canada	39,235
107	Montreal Plant (024)	Other Manufacturing	Canada	37,187
108	Meridian Brick - Aldershot	Other Manufacturing	Canada	36,765
109	Toronto Board Plant	Other Manufacturing	Canada	35,557
110	AV Cell Inc. - Specialty Cellulose Mill	Pulp & Paper Mill	Canada	33,722
111	Montreal Wallboard/Finishing Plant	Other Manufacturing	Canada	32,737
112	Calgary Wallboard Plant	Other Manufacturing	Canada	27,508
113	Vancouver Wallboard Plant	Other Manufacturing	Canada	24,580
114	Meridian Brick - Burlington	Other Manufacturing	Canada	21,726
115	Meridian Brick - Burlington	Other Manufacturing	Canada	21,693
116	Usine de PCC de Windsor	Other Manufacturing	Canada	18,943
117	Edmonton Plant	Other Manufacturing	Canada	18,605
118	Winnipeg Wallboard Plant	Other Manufacturing	Canada	17,326
119	Toronto Plant	Other Manufacturing	Canada	16,788
120	Meridian Brick - Aldershot	Other Manufacturing	Canada	15,469
121	Etobicoke Casting Plant	Metals Plant	Canada	9,171
122	McAdam Wallboard Plant	Other Manufacturing	Canada	7,261
123	Meridian Lightweight Technologies Inc. Plant E	Metals Plant	Canada	5,653
124	Meridian Lightweight Technologies Inc	Metals Plant	Canada	5,440
125	WINDSOR ALUMINUM PLANT	Metals Plant	Canada	707
126	Cap Chat Smelter & High Purity Alumina	Aluminium Smelter	Canada	458
127	Magellan Aerospace, Haley	Metals Plant	Canada	6

Method: ranked from open data — capacity and CO₂e from Climate TRACE v6 (asset-level capacity & CO₂e, CC BY 4.0). Sorted server-side; company-level data only.