Hi @rclevy, I will respond to your questions in the order they were asked:
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If you want to collect all historical outdoor sensor data, we recommend contacting us at contact@purpleair.com with further details of your inquiry. We can collect the data more efficiently when it comes to several thousands of devices. Please note that there will be costs associated with this request.
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A and B channel data are available through the API, and this can be provided.
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Correction factors cannot currently be applied to the data through the API. However, a script could be written once the data is collected.
a. We are happy to help you find the correct formulas for the required conversion factors.
b. We have a couple of examples of what the one-million starting points can purchase here: API Pricing.