Hi @Elia_Seitz,
The map download is limited in the amount of time you can download. The limits are as follows (averages are on the left, the amount of time you can download is on the right):
10-minute: 3 days
30-minute: 7 days
1-hour: 14 days
6-hour: 90 days
1-day: 1 year
1-week: 5 years
1-month: 20 years
1-year: 100 years
To download more data, you will need to use our API. We have created a download tool that will help you use the API without programming experience. More information is available here: PurpleAir Data Download Tool.