Help us document all the olive oils sold worldwide by taking photos of the packaging. It won't solve the whole problem stated by the article, but it's a good start.
http://android.openfoodfacts.org or http://ios.openfoodfacts.org
You need proper chemical testing and a proper definition of the quality of taste.
There are already a lot of tested brands so you could add a section to collect that data, although it's usually behind paywalls.