Amendment to Net Asset Value

Impax Environmental Markets plc - Amendment to Net Asset Value

Further to its announcement of yesterday, Impax Environmental Markets
plc announces amended  net asset  values ("NAV")  per ordinary  share
("Share") at the close of business on 29 September 2008 as follows:


Undiluted NAV per Share (including current financial year     111.16p
revenue items)

Undiluted NAV per Share (excluding current financial year     110.43p
revenue items)

Diluted NAV per Share (including current financial year       110.26p
revenue items)

Diluted NAV per Share (excluding current financial year       109.57p
revenue items)



Investments in  the Company's  portfolio have  been valued  on a  bid
price basis. Diluted  NAV per  Share assumes full  conversion of  all
outstanding warrants.

These amendments to  the previously  reported NAV  figures have  been
made in recognition of an error in the pricing of an investment  held
within the unquoted  portion of the  Company's portfolio. This  error
was first  made  in respect  of  the Company's  NAV  as at  close  of
business on 12 September 2008, and  has been carried through each  of
the Company's NAV  statements since  that date.  As a  result of  the
error, the  Company's  undiluted  NAV per  Share  (including  current
financial year revenue items) was overstated by 4.41 pence per  Share
at 29 September 2008.


Enquiries:

John Luetchford  020 7490 4355
Company Secretary - Cavendish Administration Ltd

Ian              Simm      020              7434               1122

Impax          Asset           Management

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