I am guessing you have an enviroseptic system.
The vents are at different heights for a reason. This is called differential venting and it helps to create a draft through your septic system and introduce oxygen into your effluent disposal area. Do not make the vents the same height it will not work the same. The vents are the way they are for a reason. This will ensure that the organisms that live within your system have plenty of oxygen and your system is at peak performance.
They do have charcoal filters like you mention. They may be worth a shot if they are not too expensive.
A properly functioning septic system should not have much if any odor associated with it. Are you noticing an odor as well? Your neighbor may have an overly sensitive nose or just not like looking at your vent pipes.
FWIW...I am a licensed septic system designer and a licensed professional engineer in the State of NH so I have a decent idea of what I am talking about.
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