Hi, it seems like air filtering is not working as expected, I am not a modder myself, but it looks like this parameter for prototype pm-air-filterer (in entities.lua) is the problem
    energy_source = {type = "void"},
    emissions_per_minute = -50,

I think it should be changed to:
    energy_source =
    {
      type = "void",
      emissions_per_minute = {pollution = -50}
    },

After changing it on my end it seems fine, I guess it might have been changed by 2.0

yeah this was changed in 2.0, thank you for the report and it'll be fixed in the next update :]