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Data source: Environmental Protection Agency
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Air quality in Mason City, Iowa correlates with...

VariableCorrelationYearsSys. Score
US production of yogurt, nonfrozenr=0.9622yrs412
Jet fuel used in Sao Tome and Principer=0.9722yrs412
The number of medical assistants in Iowar=0.9620yrs410
Jet fuel used in Timor-Lester=0.9719yrs409
US Biomass Energy Productionr=0.9717yrs408
GMO use in corn grown in Iowar=0.9623yrs399
Google searches for 'i cant even'r=0.9519yrs399
Chevron's stock price (CVX)r=0.921yrs392
Biomass power generated in Polandr=0.9236yrs392
Total number of live births in Australiar=0.9137yrs390
US production of sour creamr=0.9422yrs379
US milk fat used to produce whey products (net)r=0.9422yrs379
U.S. direct investment abroadr=0.9222yrs378
Google searches for 'how to make baby'r=0.9419yrs378
The number of pharmacy technicians in Iowar=0.9420yrs377
Hollister retail store count worldwider=0.923yrs374
China's Annual Passenger Car Productionr=0.9318yrs374
Google searches for 'headache remedies'r=0.9219yrs374
UK Service Retail Price Indexr=0.9219yrs372
The number of court and municipal clerks in Iowar=0.9120yrs372
GMO use in cornr=0.9523yrs368
GMO use in cornr=0.9523yrs368
Popularity of the first name Levir=0.9137yrs368
Popularity of the first name Brieller=0.9137yrs368
Popularity of the first name Paxtonr=0.9137yrs368
Number of Samsung Electronics Employees Worldwider=0.9114yrs366
Organic Food Sales Volume in the United Statesr=0.9313yrs366
Customer satisfaction with Southwest Airlinesr=0.8528yrs363
Fomento Econ's stock price (FMX)r=0.921yrs362
Rogers Communications' stock price (RCI)r=0.8921yrs360
How insightful SmarterEveryDay YouTube video titles arer=0.9416yrs359
Fossil fuel use in Equatorial Guinear=0.936yrs358
Annual US household spending on electricityr=0.9323yrs358
Annual US household spending on telephone servicesr=0.9323yrs358
Customer satisfaction with Motorolar=0.8718yrs356
Annual US household spending on utilitiesr=0.9123yrs356
How professional-sounding SmarterEveryDay YouTube video titles arer=0.9116yrs354
Annual US household spending on educationr=0.921yrs352
US milk fat used to produce yogurtr=0.9422yrs349
The price of goldr=0.8629yrs348
Liquefied petroleum gas used in Guinea-Bissaur=0.9136yrs347
Popularity of the 'friday friday friday' memer=0.8917yrs344
Google searches for 'scooby doo where are you'r=0.9119yrs343
The number of industrial machinery mechanics in Iowar=0.9120yrs342
Ticket prices at North American movie theatersr=0.8722yrs342
Yearly Total Gross Income of US Farmsr=0.8723yrs341
Viewership of "The Big Bang Theory"r=0.9212yrs340
Economic output of Washington metro arear=0.8921yrs340
Popularity of the 'red pill blue pill' memer=0.8617yrs340
US dairy skim solids used to produce yogurt, nonfrozenr=0.9522yrs339
Popularity of the first name Stellar=0.9137yrs338
Wind power generated in New Zealandr=0.9230yrs336
GMO use in corn grown in Iowar=0.9423yrs336
Google searches for 'how to make baby'r=0.9119yrs333
The number of respiratory therapists in Iowar=0.920yrs331
Enbridge's stock price (ENB)r=0.8821yrs329
US production of butterr=0.9322yrs328
Popularity of the first name Ryderr=0.9137yrs328
Gasoline pumped in Ecuadorr=0.936yrs326
GMO use in cottonr=0.9323yrs322
The number of registered nurses in Iowar=0.918yrs319
US milk fat used to produce butterr=0.9322yrs318
Popularity of the first name Liamr=0.937yrs316
Chunghwa Telecom Co.'s stock price (CHT)r=0.8719yrs316
GMO use in cottonr=0.9323yrs312
Wind power generated in Czechiar=0.9322yrs309
US dairy skim solids used to produce evaporated and condensed milkr=0.9422yrs308
Popularity of the first name Eastonr=0.937yrs306
EOG Resources' stock price (EOG)r=0.8521yrs304
Wind power generated in Falkland Islandsr=0.9222yrs298
US dairy skim solids used to produce butterr=0.9322yrs296
Popularity of the first name Juder=0.937yrs296
Google searches for 'i am tired'r=0.8719yrs290
Total employee count at Continental AGr=0.8524yrs289
Wind power generated in Taiwanr=0.9222yrs288
Popularity of the first name Leightonr=0.937yrs286
US milk fat used to produce sour creamr=0.9122yrs284
Number of Public Library Members in the UKr=0.9312yrs284
Jet fuel used in Samoar=0.9422yrs278
The number of civil engineers in Iowar=0.8820yrs278
Google searches for 'tummy ache'r=0.8719yrs277
Popularity of the first name Hadleyr=0.937yrs276
US dairy skim solids used to produce sour creamr=0.9122yrs273
Biomass power generated in Indiar=0.9123yrs267
Biomass power generated in Malawir=0.9122yrs256
Muenster cheese consumptionr=0.927yrs256
Biomass power generated in Rwandar=0.9122yrs246
Biomass power generated in Sloveniar=0.923yrs236
US average milk-fat content of yogurt, nonfrozenr=0.9422yrs236
US average dairy skim-solid content of cheese (other than cottage cheese)r=0.9322yrs224
Jet fuel used in Cabo Verder=0.9122yrs223
US average dairy skim-solid content of fluid beverage milkr=0.9322yrs214
Jet fuel used in Saint Kitts and Nevisr=0.9122yrs213
Portion of all US dairy skim-solids allocated to the production of cheese (other than cottage cheese)r=0.9122yrs203
Wind power generated in Bulgariar=0.9118yrs202
Gasoline pumped in Timor-Lester=0.9219yrs192
Portion of all US dairy skim-solids allocated to the production of yogurt, nonfrozenr=0.9122yrs192
Solar power generated in Gambiar=0.9117yrs181
US production of evaporated and condensed milkr=0.8922yrs172
US production of cheese (other than cottage cheese)r=0.8822yrs160
US milk fat used to produce cheese (excluding cottage cheese)r=0.8822yrs150


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You caught me! While it would be intuitive to sort only by "correlation," I have a big, weird database. If I sort only by correlation, often all the top results are from some one or two very large datasets (like the weather or labor statistics), and it overwhelms the page.

I can't show you *all* the correlations, because my database would get too large and this page would take a very long time to load. Instead I opt to show you a subset, and I sort them by a magic system score. It starts with the correlation, but penalizes variables that repeat from the same dataset. (It also gives a bonus to variables I happen to find interesting.)
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