Politicians, and even corporate C-suite, often confuse "cheaper to buy from the incumbent" with "incumbent has impossible-to-replicate technology," completely ignoring that it's way easier to invent something the second time.
Technology might have been a barrier in 1960's China, but they're a peer nation today.
After I got pm2.5 into homeassistant, I started buying MERV13 filters for central air. A jury-rigged system for turning that on/off graduated to a proper wireless thermostat, and I now have an automation that turns the fan on at pm2.5>10, then back off <3. A good 5" filter will last 9 months before the time-to-clear gets to be too long. 3 ug/m3 can be a difficult lower bound, and if it seems like we get into a bad outside aq period, I'll bump it up to 6 with a trigger at 15. MERV11 could not hold even 10 ug/m3.
My indoor aq sensor spikes from fireworks on 4th of July and neighbors cooking on the other side of the shared wall. Most interesting to me is that aq - both inside and out - is worst overnight, not at rush hour.
ed: I use https://map.purpleair.com/ for outdoor air quality. Their global data can be polled with a (free) API key, and as long as you don't poll too often, the free data limit will last years. Someone wrote an HA integration for purpleair, but it polls to often and rapidly exhausts the free data.