We had to call the paramedics on the tour I went on a few weeks ago because it got too stuffy for a lady. If your asthma is bad, I don't recommend it.
Just inhale you will be fine
There are some confined spaces in certain areas. Certain passage ways are a little narrow but at minimum.Areas are well ventilated and I can safely assume that air quality is being monitored. Was slightly stuffy during warm Seattle day but very manageable.
You can survive. Will be sneezing little bit, but survive.
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