https://www2.purpleair.com/products/list ສໍາລັບຂ້ອຍພວກເຂົາເບິ່ງຄືວ່າບໍລິສັດທີ່ຂາຍຜະລິດຕະພັນແລະແຜນທີ່ຂອງພວກເຂົາແມ່ນຮອງ. ພວກ​ເຂົາ​ເຈົ້າ​ແມ່ນ​ແຕ່​ການ​ໂຄ​ສະ​ນາ​ຂອງ​ເຂົາ​ເຈົ້າ​ກ່ຽວ​ກັບ​ແຜນ​ທີ່​ຂອງ​ຕົນ​ເອງ.

“PurpleAir is built on the ideal of sharing data and by doing this, empowering individuals to effect change. All public PurpleAir data is available to download under various licenses from private, not for profit use to educational and commercial use. The common element between these uses is to share attribution.” (https://community.purpleair.com/t/about-the-data-category/70) – based on that maybe 4/5 blocks would be accurate. There do not seem to be any trackers or advertisements on the site.