As far as I understand, the middle ear has air in it, and the squeezing feeling felt when descending into the depths of the ocean or ascending into the sky is caused by an imbalance in the air pressure of the air in the middle ear and the air in the environment. My question is, if you were presently in a smoggy environment and you "equalized", would that smog get trapped in the middle ear and cause damage as soon as the eustachian tube sealed off the middle ear once more?