The historical endpoints in the PurpleAir API have recently become restricted due to extremely heavy use. To use the historical API, you will need to be granted access. To gain access, contact us at firstname.lastname@example.org with your API keys and a description of your API usage. This includes the frequency at which you will request data.
All API keys will now have access to the historical endpoints. If your keys do no have access, email us at email@example.com with your API keys to be granted access.
If you do not have API keys, you may create them here: PurpleAir Develop
API keys are created per user and not per sensor.
Learn more information more information about creating API keys here: Creating API Keys
The Real-time API may solve your problem
If you are creating a sensor database, we prefer you use the real-time API to query a group of sensors every minute or so. This is more cost-effective and less server-intensive for PurpleAir.
An additional benefit of this approach is that you’re able to create a group of sensors and download data for all sensors in the group. This feature is not yet available with the History API; you will need to download the data one sensor at a time.
More information can be found in our API use guidelines.