https://www2.purpleair.com/products/list මට ඔවුන් නිෂ්පාදන අලෙවි කරන සමාගමක් ලෙස පෙනෙන අතර ඔවුන්ගේ සිතියම ද්විතීයික වේ. ඔවුන් තමන්ගේ දේවල් සිතියමේ පවා ප්‍රචාරය කරනවා.

“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.