> Install a HEPA cabin air filter in your car. If you drive a lot this should be #1 on your list. How come this is not an absolute standard in the automotive i

> Install a HEPA cabin air filter in your car. If you drive a lot this should be #1 on your list. How come this is not an absolute standard in the automotive industry? Last time I have tried to purchase a HEPA cabin filter for my Hyundai i40 I failed to find any.