@Jake, Do you have filters too? And cost?
Pollution in CD is getting worse.. I guess i might stick to another year out where i am, the air does not seem too bad.
Also update on my mask. After 4 days of usage and throughout Saturday night at the Halloween party, there were very noticeable accumulation of smog degree and other pollutants. I washed it to see if it will do anything (mask and filter), it did, but i will need another filter. Hopefully not every 4 days or so…