how many kinds of poputions are there?

how many kinds of poputions are there?
how many kinds of poputions are there?

how many kinds of poputions are there?
是POLUTION吧?
哪里一共有多少种污染?

poputions 我在想是不是populations
那有多少(生物)族群?

这儿有多少种流行艺术.
poputions这个词可能有错误,只能翻译成这种效果了.