> I saw a bunch of personal air filtration systems meant specifically for cars for sale in Delhi markets when I was there
That doesn't mean they work. Cars just aren't well sealed in general and you need to move a lot of air through a filter to clear the space faster than pollution is coming in. You might make a small dent but it isn't going to be great. The second you open the door or turn on the A/C you've lost the game.
I'm sure luxury hotels have good HVAC, but an AQI of 600 is just not what any traditional HVAC system is designed for. Now there have been advances and a bunch of stuff was specifically developed for the Beijing olympics, but that's a much lower level of pollution. Even there, high end hotels are running two HVAC systems. It's clearly not impossible, but merely being wealthy isn't going to save you from that level of pollution, it's just going to be less bad.
That doesn't mean they work. Cars just aren't well sealed in general and you need to move a lot of air through a filter to clear the space faster than pollution is coming in. You might make a small dent but it isn't going to be great. The second you open the door or turn on the A/C you've lost the game.
I'm sure luxury hotels have good HVAC, but an AQI of 600 is just not what any traditional HVAC system is designed for. Now there have been advances and a bunch of stuff was specifically developed for the Beijing olympics, but that's a much lower level of pollution. Even there, high end hotels are running two HVAC systems. It's clearly not impossible, but merely being wealthy isn't going to save you from that level of pollution, it's just going to be less bad.