With all due respect, and I mean that seriously, I think that your focus on government subsidies is causing you to be overly negative on this feature. I was us

With all due respect, and I mean that seriously, I think that your focus on government subsidies is causing you to be overly negative on this feature. I was using Singapore/Indonesia/China as examples of places that I was either directly familiar with, or had recently read about. If it's really important to you, then you can replace those countries with "Heavily Smog impacted regions of the United States, Roads experiencing forest fires (very common), or an driving situation in which particulate matter is problematic for which the driver would like to reduce somewhat" It's a great function for the home, and I think most drivers would be well served - and in the case of drivers with Asthma, or other ailments impacted by particulate pollution) critically served.