Holding(s) in Company

Porvair PLC
24 January 2006



          SECTION 198 COMPANIES ACT 1985 - 3% NOTIFIABLE INTEREST

We have been advised of the following holding by Impax Environmental Markets plc 
and certain of its subsidiary companies

Registered owner                     No. of shares     % holding

Impax Environmental Markets plc          1,617,000          3.96
(Nortrust Nominees Limited)



Letter to     Porvair Plc
Letter dated  24 January 2006

In accordance with section 198 of the Companies Act 1985 we give notice that 
Impax Environmental Markets plc has a total interest in 1,617,000 ordinary 2p 
shares in your company.

Based on our understanding that your company has 40,830,000 ordinary shares in 
issue, this represents 3.96% of the shares in this class. The holding is 
registered in the name of Nortrust Nominees Limited A/c IEM01.


Letter from Impax Environmental Markets plc



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