Increasing the averaging period will show more data on the graph. Weekly averages can show up to five years worth of data. All public data recorded by the sensor will be shown for the past five years if weekly averages are used.
A table showing the maximum time shown for an averaging period is available in our article on looping API calls. The exact same time period restrictions are used for the map and the API.
If you have further questions on data, you can make a post in the forum’s data category or send an email to contact@purpleair.com.