considering I'm sitting here in the middle of the fires here in Los Angeles I could use something like this.  Just yesterday I opened the window to see if there was smoke and I smelled none.  I went to shower and when I got out 10 minutes later my entire house was filled with the smell of smoke.  The wind shifts that fast.  We have smog and other crap which deteriorates the air quality.  Something like this would be nice to have.