Vent question, trying to fix ammonia smell

[ntsorvas]

When I built the coop I installed a roof tent but I'm pretty sure I need more ventilation because the coop smells pretty bad of ammonia. My question is if I install vents at the top of the front or back walls would this work or do the vents have to be in the roof. I don't want to cut holes in the roof if I don't need to

 

[PoultryGirly]

The ventilation holes can be anywhere. It doesn't matter.