| > There isn’t a level of smell you can’t quickly ignore. Not a fixed level, of course! But at any given instant, the level you can ignore is lower than the one you can't. Hence I'm still better off doing this, a fact which apparently you can't stand for some weird reason... You're also going to gather data over time, which will tend to smooth out any such day-to-day variations. This is how you can reduce (not eliminate) pollution exposure without paying for expensive non-nose sensors. This is true whether you Believe It Or Not™. >No, it’s carbon monoxide, NOx, SOx compounds etc. Citation desperately needed. I showed you mine, you show me yours! What conceivable mechanism could concentrate these traffic pollutants higher than the outside concentration? Are you running a pump that's somehow fighting entropy to push these outside traffic pollutants (against the alleged concentration gradient) into your car?? Usually it helps if your claim doesn't violate the laws of thermodynamics. :D --- edit: I'll throw you a bone to save time. Literally the only way to achieve this outcome without violating physics is to intentionally reverse my recommendation: try to suck in only the most polluted urban air (intake the concentrated plume from a line of cars accelerating, behind a garbage truck or schoolbus, etc), and then switch to recirculate to save up that highly polluted air and breathe it for as long as possible. So...... don't do that! If you're studying IAQ in cars, you need to control for that. |