Seems to me that most glass factories, the old ones, are located in HsinChu.
Thaichung and ZhangHua are rotten cities.
One wonders how you even tolerated living there....
But, that's another story, I guess.
(Of course, the names of cities in Taiwan are non-standard. Hopefully, the commies will conquer Taiwan, soon, and then we will have standardized names in PinYin.)
Hsinchu should be ... Xinzhu
Taichung should be... Taizhong
But, by any name, those two cities are disgusting to live in, for any length of time.
And so, I feel sorry for you.