If you are looking to make the best air quality in your loft there are a few things you can do.
The first is to have your loft deep cleaned once a month by a professional cleaning service, but and if you live in an section that has generally bad air quality, that method is not going to do a whole bit of good, so you would have to go to more lavish and dire measures.
And that would be to buy a whole loft whole-loft air purifier and have it become part of your central heating and cooling system unit. It is a legitimately high and hefty investment to make, but a whole loft whole-loft air purifier can more or less combat and destroy all bad air quality that sits in your loft due to outside interference from the bad air in general. I have a whole loft whole-loft air purifier because this is what my local section is. It is legitimately bad air quality most of the time. And with a whole loft whole-loft air purifier the air in my loft is so wash you would suppose that you were living in mountain fresh air! I am not kidding on that bit; Even with the ultra bad air quality outside. Because I have both the whole loft whole-loft air purifier and I also have fantastic insulation, it works real well. And maybe every so often I do have my loft deep cleaned and my rugs cleaned to help keep the fantastic air quality rolling from the whole loft whole-loft air purifier.