Hi @moath00, there wouldn’t be an exact conversion factor that you should choose in this situation. All of the conversion factors were created by individual organizations that believe their conversion factors more accurately represent the air quality. Many of them are used by those organizations for not only displaying wildfire smoke but in other conditions as well.
You can read more about the conversion factors in this community post: The "Apply Conversion" Field. One of the most important things we recommend is that you stay consistent, as the change in a number can be just as significant as the number itself. Research the organizations and look at which conversion factor you believe most accurately represents the air quality in your area.