QuestAir and ExxonMobil Research and Engineering Company Initiate Third Phase of Project to Develop On-Board Hydrogen Generator

FOR: QUESTAIR TECHNOLOGIES INC.

TSX, AIM SYMBOL: QAR

August 2, 2007

QuestAir and ExxonMobil Research and Engineering Company Initiate Third Phase of Project to Develop On-Board
Hydrogen Generator

BURNABY, BRITISH COLUMBIA--(CCNMatthews - Aug. 2, 2007) - QuestAir Technologies Inc. (TSX:QAR)(AIM:QAR) announced
today that it has received a US$1.8 million engineering services contract from ExxonMobil Research and Engineering
Company ("EMRE") to support the development of a compact rapid cycle pressure swing adsorption unit for use in a
benchtop on-board hydrogen generator. Applications for the generator could include fuel cell powered industrial
vehicles. Longer term the technology offers the potential to play a key role in providing an "infrastructure
bridge" for automotive fuel cell deployment.

Jonathan Wilkinson, President and CEO of QuestAir, said the contract, which is the third major phase of the joint
development program, follows on from work that has been ongoing between QuestAir and EMRE since 2003.

"The hydrogen generation system that EMRE and QuestAir are developing aims to provide a compact, efficient and
cost effective solution to generate hydrogen directly on board the vehicle itself from readily available
hydrocarbon fuels," Wilkinson added.

About QuestAir Technologies Inc.

QuestAir Technologies Inc. is a developer and supplier of proprietary gas purification systems for a number of
significant international markets, including existing markets such as oil refining, biogas production, hydrogen
generation, hydrogen recovery and natural gas processing, as well as emerging markets such as fuel cell vehicle
refueling stations. QuestAir is based in Burnaby, British Columbia and its shares trade on the AIM Market of the
London Stock Exchange Plc. and on the Toronto Stock Exchange under the symbol "QAR".

Forward-looking statements

Certain statements in this press release may constitute "forward-looking" statements which involve known and
unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of
the Company, or industry results, to be materially different from any future results, performance or achievements
expressed or implied by such forward-looking statements. When used in this press release, such statements use such
words as "anticipate", "believe", "plan", "estimate", "expect", "intend", "may", "will" and other similar
terminology. These statements reflect current expectations regarding future events and operating performance and
speak only as of the date of this press release. Forward-looking statements involve significant risks and
uncertainties, should not be read as guarantees of future performance or results, and will not necessarily be
accurate indications of whether or not such results will be achieved. A number of factors could cause actual
results to differ materially from the results discussed in the forward-looking statements.

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FOR FURTHER INFORMATION PLEASE CONTACT:

QuestAir Technologies Inc.
Sherry Tryssenaar
Chief Financial Officer
(604) 453-6902
Email: tryssenaar@questairinc.com
Website: www.questairinc.com

Buchanan Communications
Charles Ryland
UK media contact
020 7466 5000

Buchanan Communications
Ben Willey
UK media contact
020 7466 5000

Buchanan Communications
Eleanor Williamson
UK media contact
020 7466 5000

Karyo Edelman
Stephen Burega
Canadian media contact
(604) 623-3007

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