Look for a rating called a MERV number, and your filters should have numbers that go to 11 at least.

寻找一个称为 MERV 编号的评级，您的过滤器应该至少有 11 个数字。

You want something with HEPA or MERV filters — those are the kind used in hospitals that block really small particles like those found in wildfire smoke.

你需要配 HEPA 或 MERV 过滤器的空气净化器——这种过滤器用于医院，可以阻挡野火烟雾中的微小颗粒。