I think it may depend on the age of the glass, how it has been treated in the past, and the type of dirt in your environment.
Where I live, we have a chipboard factory nearby. They claim that no pollution escapes, but i have a layer of dust on all surfaces at least every 2 days.
My mother never had any dust, even after 2 weeks. She lived near Newmarket, where there was practically no industry, the surrounding flat East Anglian countryside meant that the wind carried everything away and all the surrounding fields were grassy meadows and paddocks for the horses. Agriculture is mixed, but there were also plenty of sheep and cows and less grain.