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GEMStat - The global water quality database — 18 websites ranked by shared content topics, category and on-page relevance.

Each result shows its full tech stack, contacts and AI-policy — not just a name · Browse all sites in Environment →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
purpleair.com ↗	62 match shared topic	Real-time Air Quality Monitoring by PurpleAir	en	environment Shopify	robotsllmsaihumans	emailphone	none
wattsupwiththat.com ↗	62 match shared topic	Watts Up With That? - The world's most viewed site on global warming and climate change	en	environment WordPress	robots llmsaihumans	emailphone	none
aqicn.org ↗	62 match shared topic	Beijing Air Pollution: Real-time Air Quality Index	en	environment	robotsllmsaihumans	emailphone	none
4ocean.com ↗	62 match shared topic	4ocean \| The Global Movement to Reduce Plastic + Trash in Our Oceans	en	environment Shopify	robotsllmsaihumans	emailphone	none
foodandwaterwatch.org ↗	62 match shared topic	Food & Water Watch \| Food & Water Watch	en	environment WordPress	robotsllmsaihumans	emailphone	none
globalforestwatch.org ↗	62 match shared topic	Forest Monitoring, Land Use & Deforestation Trends \| Global Forest Watch	en	environment	robotsllmsaihumans	emailphone	none
worldcleanupday.org ↗	62 match shared topic	World Cleanup Day – Join the Global Movement for a Cleaner Planet	en	environment	robotsllmsaihumans	emailphone	none
ecovillage.org ↗	62 match shared topic	Global Ecovillage Network	en	environment WordPress WooCommerce	robotsllmsaihumans	emailphone	none
americanwhitewater.org ↗	62 match shared topic	American Whitewater Homepage	en	environment WordPress	robotsllmsaihumans	emailphone	none
footprintnetwork.org ↗	62 match shared topic	Home - Global Footprint Network	en	environment WordPress	robotsllmsaihumans	emailphone	none
savetheboundarywaters.org ↗	62 match shared topic	Protect the Boundary Waters from sulfide-ore copper mining. \| Save the Boundary Waters	United States~ en	environment Drupal	robotsllmsaihumans	emailphone	none
un-ihe.org ↗	62 match shared topic	IHE Delft Institute for Water Education \| IHE Delft Institute for Water Education	en	environment	robotsllmsaihumans	emailphone	none
wrap.org.uk ↗	62 match shared topic	WRAP - The Global Environmental Action NGO	United Kingdom en	environment Drupal	robotsllmsaihumans	emailphone	none
earthcharter.org ↗	62 match shared topic	Earth Charter in Action - Powering a global movement	en	environment WordPress	robotsllmsaihumans	emailphone	none
justdiggit.org ↗	62 match shared topic	Justdiggit \| Cooling Down The Planet \| Global Warming Charity	en	environment WordPress	robotsllmsaihumans	emailphone	none
wrap.ngo ↗	62 match shared topic	WRAP - The Global Environmental Action NGO	en	environment Drupal	robotsllmsaihumans	emailphone	none
consciousplanet.org ↗	62 match shared topic	Global Movement to #SaveSoil	India~ en	environment DatoCMS	robotsllmsaihumans	emailphone	none
globalgeoparksnetwork.org ↗	62 match shared topic	Global Geoparks Network \| International Association on Geoparks	en	environment Drupal	robotsllmsaihumans	emailphone	none

How the match score works

Each match is a 0–100 similarity score — the higher it is, the more two sites resemble one another. It’s computed automatically from our own crawl data (never from what a site says about itself) by combining several independent signals, so a high score means several of them point the same way:

shared topics how many of the same fine‑grained content topics (IAB sub‑categories) both sites cover — the main signal.
same category whether they sit in the same business / industry category.
content & title how closely their titles and page descriptions line up in wording and meaning.

No single signal decides the result — they’re blended together. Treat the score as a way to rank candidates rather than an absolute percentage; the chips on each result show which signals contributed.