About Where to download free air sensor data

I am currently working on a mini project with a base paper topic " The AirSensor open-source R-package and DataViewer web application for interpreting community data collected by low-cost sensor networks" in this paper it has said that the base archive url is “http://smoke.mazamascience.com/data/PurpleAir” when i load this there is no page or data available, so after searching for it i came to this page and here i don’t know how to access the air monitoring data for free. please help me.
this is my base paper link:https://www.sciencedirect.com/science/article/pii/S1364815220308896?via%3Dihub
I don’t know what to do. I am stuck please help me as soon as possible.

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Open source community driven sensor data is unfortunately dead today as a concept as Purple air has chosen to monetize that data.
So there is no longer open source community driven sensor data available without charge.
The communities sensor data is now in essence behind a purple air pay wall.
So small research projects can not longer function without financing to pay for the sensor data. Tragic but this is how it is today.
To lower the cost of hosting this data for the community Purple air could have chosen to allow other research institutions such as university and research companies to host the open source community driven sensor data as other open source data organizations have successfully done but purple air has chosen not to do so.