EXHIBIT 4  CERTIFICATIONS  I, Jeffrey M. Lipton, certify that:  1.I have reviewed this annual report
on Form 40-F of NOVA Chemicals Corporation;  2.Based on my knowledge, this report
does not contain any untrue statement of a material fact or omit to state a
material fact necessary to make the statements made, in light of the
circumstances under which such statements were made, not misleading with
respect to the period covered by this report;  3.Based on my knowledge, the financial
statements, and other financial information included in this report, fairly
present in all material respects the financial condition, results of operations
and cash flows of the issuer as of, and for, the periods presented in this
report;  4.The issuers other certifying officer
and I are responsible for establishing and maintaining disclosure controls and
procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the
issuer and have:  a)designed such disclosure controls
and procedures, or caused such disclosure controls and procedures to be
designed under our supervision, to ensure that material information relating to
the issuer, including its consolidated subsidiaries, is made known to us by
others within those entities, particularly during the period in which this
report is being prepared;  b)evaluated the effectiveness of the
issuers disclosure controls and procedures and presented in this  report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the end of the
period covered by this report based on such evaluation; and  c)disclosed in this report any change
in the issuers internal control over financial reporting that occurred during
the period covered by the report that has materially affected, or is reasonably
likely to materially affect, the issuers internal control over financial
reporting; and  5.The issuers other certifying
officer and I have disclosed, based on our most recent evaluation of internal
control over financial reporting, to the issuers auditors and the audit
committee of the issuers board of directors (or persons performing the
equivalent functions):  a)all significant deficiencies and
material weaknesses in the design or operation of internal control over
financial reporting which are reasonably likely to adversely affect the
issuers ability to record, process, summarize and report financial
information; and  b)any fraud, whether or not material,
that involves management or other employees who have a significant role in the
issuers internal control over financial reporting.   Date: 
  March 15, 2004
  /s/ Jeffrey M. LiptonJeffrey M. LiptonChief Executive Officer(Principal Executive Officer)  
   I, Larry A. MacDonald, certify that:  1.I have reviewed this annual report
on Form 40-F of NOVA Chemicals Corporation;  2.Based on my knowledge, this report
does not contain any untrue statement of a material fact or omit to state a
material fact necessary to make the statements made, in light of the
circumstances under which such statements were made, not misleading with
respect to the period covered by this report;  3.Based on my knowledge, the financial
statements, and other financial information included in this report, fairly
present in all material respects the financial condition, results of operations
and cash flows of the issuer as of, and for, the periods presented in this
report;  4.The issuers other certifying
officer and I are responsible for establishing and maintaining disclosure
controls and procedures (as defined in Exchange Act Rules 13a-15(e) and
15d-15(e)) for the issuer and have:  a)designed such disclosure controls and
procedures, or caused such disclosure controls and procedures to be designed
under our supervision, to ensure that material information relating to the issuer,
including its consolidated subsidiaries, is made known to us by others within
those entities, particularly during the period in which this report is being
prepared;  b)evaluated the effectiveness of the
issuers disclosure controls and procedures and presented in this  report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the end of the
period covered by this report based on such evaluation; and  c)disclosed in this report any change
in the issuers internal control over financial reporting that occurred during
the period covered by the report that has materially affected, or is reasonably
likely to materially affect, the issuers internal control over financial
reporting; and  5.The issuers other certifying
officer and I have disclosed, based on our most recent evaluation of internal
control over financial reporting, to the issuers auditors and the audit
committee of the issuers board of directors (or persons performing the
equivalent functions):  a)all significant deficiencies and
material weaknesses in the design or operation of internal control over
financial reporting which are reasonably likely to adversely affect the
issuers ability to record, process, summarize and report financial
information; and  b)any fraud, whether or not material,
that involves management or other employees who have a significant role in the
issuers internal control over financial reporting.   Date: 
  March 15, 2004
  /s/ Larry A. MacDonaldLarry A. MacDonaldChief Financial Officer(Principal Financial Officer)