Henu the Great said:

Yes, you can continue doing them. Raising energy and doing balancing, such as sun/moon breathing will help alleviate sickness. If you are so sick you can barely speak then that would be another matter. In such case, just take it easy for as long as the worst goes away and continue then. By not doing anything you will not counter the negative as well as when you do these.

As for the pollution, if you live somewhere where it is literally smog in the air most of the day then you could find a spot where is less than average pollution or you could time your breathing exercises to the time of day when the pollution is at its lowest.

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