EXHIBIT 99.4

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to use of our reports dated
March 5, 2009 with respect to the consolidated financial statements of NOVA Chemicals Corporation comprising the Consolidated Balance Sheets of NOVA Chemicals Corporation as at December 31, 2008 and 2007, and the related Consolidated Statements of
Income (Loss), Comprehensive Income (Loss), Changes in Shareholders Equity, and Cash Flows for each of the years in the three-year period ended December 31, 2008 and the effectiveness of internal control over financial reporting of NOVA
Chemicals Corporation for the year ended December 31, 2008, included in an exhibit to the Annual Report (Form 40-F) for 2008.

We also
consent to the incorporation by reference in the following Registration Statements:



| | (1) | Registration Statement (Form S-8 No. 333-101793) pertaining to the Employee Savings and Profit Sharing Plan for Canadian Employees, the Director Share Unit Plan, the Deferred Share
Unit Plan for Key Employees, the Deferred Share Unit Plan for US Key Employees and the Deferred Share Unit Plan for Non-Employee Directors of NOVA Chemicals Corporation, and the Employee Savings and Profit Sharing Plan for US Employees, the US
Savings and Profit Sharing Restoration Plan and the Capital Accumulation Plan of NOVA Chemicals Inc.
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| | (2) | Registration Statements (Form S-8 Nos. 33-47673, 333-520, 333-9076 and 333-12910) pertaining to the Employee Incentive Stock Option Plan (1982) of NOVA Chemicals Corporation
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| | (3) | Registration Statement (Form S-8 No. 333-9078) pertaining to the Employee Savings and Profit Sharing Plan for Canadian Employees of NOVA Chemicals Corporation
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| | (4) | Registration Statement (Form S-8 No. 33-86218) pertaining to the Employee Savings and Profit Sharing Plan for NOVA Chemicals Inc. (formerly Polysar Incorporated)
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| | (5) | Registration Statement (Form S-8 No. 33-77308) pertaining to the Director Share Purchase Plan of NOVA Chemicals Corporation
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| | (6) | Registration Statement (Form S-8 No. 333-11280) pertaining to the Beaver Valley Hourly Plan of NOVA Chemicals Corporation
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| | (7) | Registration Statement (Form S-8 No. 333-109424) pertaining to the Restricted Stock Unit Plan of NOVA Chemicals Corporation
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of our reports dated March 5, 2009 with respect to the consolidated financial statements of NOVA Chemicals Corporation and the effectiveness of internal control over
financial reporting of NOVA Chemicals Corporation, included in the Annual Report (Form 40-F) for the year ended December 31, 2008.



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|Calgary, Canada |  | LOGO                 
|March 13, 2009  |  | Chartered Accountants