I would suggest monitoring the params of the storage tanks closely. If the air pumps ARE in the garage, then they are definitly pumping fumes into the water. It will be VERY noticeable if any of the fumes in the garage are frrom a diesel vehicle...ie oil slick on the water surface. Your best bet is to drill a small hole through the wall and move the pump to the other side...drill 2 holes in the lid of your holding containers...1 hole will be for the airline to go into the container...the second hole is a vent to relieve the internal build-up of the air from the airline...the positive pressure created in the container will help to prevent any car exhaust fumes from getting into the water.
HTH
edit...as for the RO unit, it will be fine since it is completely sealed
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