Back in 2016, Tesla launched a new option for its Model S called Bioweapon Defense Mode, which uses a HEPA air filter it claims is 100 times more effective than your average cabin air filter, removing 99.97 percent of fine particulate matter. But Tesla wasn't the first to think of adding powerful air filters to its cars.
Saab, the now-defunct Swedish car builder, had a similar idea back in the Nineties. From the 1991 model year onward, it made electrostatic particulate ventilation air filters standard throughout its 9000 model range, able to filter anything as small as four microns. It meant people with allergies could take a nice spring drive without having to worry about constantly sneezing behind the wheel, according to this in-period review from MotorWeek.
If you opted for the Turbo model, your allergy-battling 9000 got a 2.3-liter inline-four with 200 horsepower and 244 lb-ft of torque, able to sprint to 60 mph in 7.5 seconds. Pair that with the stylish looks and well-designed interior, and you had yourself one competent machine.
Brian Silvestro is Hearst Autos' former lead deputy editor for rankings content. He spent over seven years as a staff writer for Road & Track Magazine where he contributed car reviews, industry interviews, and more. He has a taste for high-mileage, rusted-out projects and amateur endurance racing.
