However the JSON file for the request is not working when I use “One_Sensor_Info = response.json()” or “One_Sensor_Info = json.loads(response.text)” and I get the error “JSONDecodeError: Expecting ‘,’ delimiter”. When I use “report = response.text”, I can see data (copied below) in the report. The largest network of monitors in the United States is maintained by the. However, it is crucial to determine the quality of these measurements. Large quantities of real-time particle data are becoming available from low-cost particle monitors. PubMed Calibration of PurpleAir PA-I and PA-II Monitors Using Daily Mean PM 2.5. Instead we created our own algorithm (called ALT-CF3) available as a “conversion factor” on the PurpleAir map page and “PM2.5 alt” at the API site.Īn important finding was that the PA-I and PA-II monitors had identical calibration factors, despite having different sensor models. We found both the Plantower proprietary algorithms (CF_1 and CF_ATM) to be useless, reading zero an unacceptably high fraction of the time and also overestimating the actual PM2.5 by 40-90%. We compared them to the regulatory monitors in the three states to get a calibration factor. (77 million hourly outdoor values and 20 million hourly indoor values). My colleagues and I used the old API site to download more than 14,000 PurpleAir sites in Washington, Oregon, and California covering the years 2017-2021. You can learn more at the following article: (Outdated) Historical API Endpoints are now Restricted. Update: Access to the historical API has been restricted. Please look out for an announcement in the coming weeks. We are currently updating our API Terms of Service and Attribution guidelines. If you experience any issues with the new version, for a limited time, the previous version of the API will be available at. We encourage you to get familiar with and switch to the new API’s history endpoints as soon as possible before ThingSpeak is no longer available. The ThingSpeak service will stop working in or around August 2022. If you use ThingSpeak for historic data, you will need to migrate your code to use the PurpleAir API instead. This preview URL will go away, so please be sure only to use it until the main URL is updated. You’ll find documentation within the API site explaining how to use these new endpoints.īefore the 18th, you may test them here. We added features that provide access to historical data. It is important to note this update provides no functional changes to our current API at, but rather adds new history endpoints. This new API provides access to historic data that is now hosted on Google’s BigQuery. We are excited to let you know that we will be releasing a new version of the PurpleAir API on July 18, 2022.
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