Why?  Because air pollution in Taiwan has become more and more severe everyday.  Blurred skies to see and stale air to breathe are the new normality on the island.  What can you expect from a government like DPP administration who refuses cheap clean energy and relies on dirty coal and unrealistic, expensive "new" energy?  So keep on wearing a mask from now on, for pandemic will go away, but not so the air pollution.

By the way, I am a light smoker who is always seeking a "safe" place like a scaring rat.  If everybody is wearing a mask, I guess I would receive less abhoring eyes that cast on me whenever that bad habit is irresistible to me, ha.