The current study only relied on the fumes of car exhaust, but there may be other forms of air pollution that work even faster and with worse effects.the toxic fumes were breathed in by 170 million Americans or more, resulting in aGas might not contain lead today, but that doesn't mean it's safe for your lungs, or your brain.
"People may want to think twice the next time they're stuck in traffic with the windows rolled down,""It's important to ensure that your car's air filter is in good working order, and if you're walking or biking down a busy street, consider diverting to a less busy route." For much of the world, however, polluted air is inescapable. We need to know what that is doing to our brains in the long run.
It would depend!! If you’re in a closed car garage it may take less than 2 hrs to shut down all brain activity