I have had life long asthma. 

Furnace filter = https://www.amazon.com/dp/B003J7JSFY/ref=dp_cerb_3    merv 12


IQ Air = https://www.sylvane.com/iqair-gc-multigas-air-purifiers.html      2 units


Lastly

https://www.amazon.com/Molekule-air-purifer-Dual-Filtration-System/dp/B07Q33GV1V/ref=sr_1_8?



all of the above has helped me not have a full blown asthma attack in more then 10 years.


I always look for good prices on the replacement parts.

I could rant about air quality for hours, but I don't.

This time I talked a bit because my wife never drinks never smokes never does drugs.

Yet she got very ill quite scary for me and her.