Once again, your advice goes against the advice of almost every Allergist and Asthma doctor on this planet, and against proven medical science, and could be harmful to others who actually do have Asthma.
I open up my windows and air out my place, for about 30 minutes, every other day, or so, to let out indoor built-up gasses and indoor allergens, but I only do it when the outside air is relatively safe, and when there is a good breeze outside.
How do I know if the outside air is safe for my Asthma? I go outside and test it. If I go outside and I get tightness in my chest (labored breathing), I refrain from opening up the windows.
Your knowledge of pollens also goes against medical science. There are a variety of pollens and pollutants and irritants and triggers in the outside air every day of the year, some days and seasons worse than others.
And, someone with Asthma should not live next to a place with a lot of trees, or grasses, or weeRAB, that trigger their Asthma, but it isn't always possible to avoid cities, and traffic, and exhausts, and pollens, and pollutants, and "triggers".
What is the answer?
Immunization!
There are at least three conventional ways to immunize against Asthma, or Sinus Allergies, SLIT, SCIT and RUSH; and then, of course, there is always Acupuncture as a treatment for Allergies.
Personally, I am trying do-it-yourself SLIT at home on an experimental basis, as a treatment for my Asthma, and so far, the experience is a lot better than I expected.
Anyways...... best of luck moving out of the city and finding a place to live that is free from pollens, and pollutants, and irritants and various other "triggers", and best of luck finding a good supply of oxygen! :wave: