** Environmental Group EGL.AX rises as much as 4.9% to A$0.215, highest since March 17
** Emission control systems provider's unit Total Air Pollution Control secures A$9 mln ($6.21 mln) contract
** Contract awarded by Ozango Minerais S.A., a unit of Pensana PLC and owner of Longonjo Rare Earth Refinery Project, in Angola
** Under deal, TAPC's off-gas scrubbing system will control, treat process emissions, others
** YTD, EGL down 6.5%
($1 = A$1.4503)
(Reporting by Sherin Sunny in Bengaluru)
((Sherin.Sunny@thomsonreuters.com))