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Data source: Environmental Protection Agency
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Air quality in Memphis correlates with...

VariableCorrelationYearsSys. Score
Biomass power generated in Indiar=0.9623yrs414
Biomass power generated in Papua New Guinear=0.9622yrs414
China's Annual Passenger Car Productionr=0.9618yrs408
Wind power generated in Bulgariar=0.9518yrs408
Number of Walmart stores worldwider=0.9515yrs406
Number of Public Library Members in the UKr=0.9712yrs405
Global Apple iPhone Sales in Q3r=0.9512yrs400
GMO use in cornr=0.9624yrs400
Fomento Econ's stock price (FMX)r=0.9322yrs398
Colgate-Palmolive Company's stock price (CL)r=0.9222yrs396
Dominion Energy's stock price (D)r=0.9122yrs394
US household spending on rented dwellingsr=0.9623yrs393
US household spending on healthcarer=0.9623yrs393
US household spending on health insurancer=0.9523yrs392
US average dairy skim-solid content of yogurt, nonfrozenr=0.9722yrs390
U.S. direct investment abroadr=0.9522yrs382
The number of pharmacists in Tennesseer=0.9520yrs380
US production of dry milk products (net)r=0.9422yrs379
US dairy skim solids used to produce yogurt, nonfrozenr=0.9522yrs379
Biomass power generated in Solomon Islandsr=0.9616yrs378
Google searches for 'how to make baby'r=0.9420yrs378
Google searches for 'tummy ache'r=0.9220yrs376
The number of building inspectors in Tennesseer=0.9320yrs376
The number of respiratory therapists in Tennesseer=0.9220yrs374
Adidas Group's Global Net Salesr=0.9123yrs372
Global Net Sales for Walmartr=0.9317yrs372
Total Revenue of the NFL Teamsr=0.920yrs371
Revenue of US Broadcasting Industryr=0.9217yrs371
Petroluem consumption in Timor-Lester=0.9619yrs368
GMO use in cottonr=0.9423yrs363
GMO use in cotton in Tennesseer=0.9518yrs360
Annual US household spending on telephone servicesr=0.9423yrs360
Gasoline pumped in Timor-Lester=0.9619yrs358
Annual US household spending on rented dwellingsr=0.9323yrs358
Annual US household spending on health insurancer=0.9323yrs358
How good SmarterEveryDay YouTube video titles arer=0.9317yrs358
Annual US household spending on healthcarer=0.9223yrs357
US household spending on fresh fruitsr=0.9223yrs357
How insightful SmarterEveryDay YouTube video titles arer=0.9217yrs357
Google searches for 'i cant even'r=0.8620yrs356
How professional-sounding SmarterEveryDay YouTube video titles arer=0.9117yrs356
Annual US household spending on fresh fruitsr=0.923yrs354
US production of whey products (net)r=0.9322yrs348
Popularity of the 'red pill blue pill' memer=0.8918yrs345
Solar power generated in Angolar=0.9612yrs344
The number of sonographers in Tennesseer=0.9120yrs344
Ticket prices at North American movie theatersr=0.8922yrs344
US Wind Power Generation Capacityr=0.923yrs344
Total employee count at Continental AGr=0.8724yrs342
Popularity of the 'drake' memer=0.8718yrs342
US production of sour creamr=0.9322yrs338
CVS stock price (CVS)r=0.922yrs336
The number of transportation, storage, and distribution managers in Tennesseer=0.9120yrs332
US milk fat used to produce yogurtr=0.9322yrs328
Biogen's stock price (BIIB)r=0.922yrs323
The number of interpreters and translators in Tennesseer=0.9120yrs322
US dairy skim solids used to produce dry milk productsr=0.9422yrs318
Hydopower energy generated in Greenlandr=0.9523yrs313
Cognizant Technology Solutions' stock price (CTSH)r=0.922yrs313
The number of pharmacy technicians in Tennesseer=0.920yrs311
Google searches for 'scooby doo where are you'r=0.8920yrs311
US production of cheese (other than cottage cheese)r=0.9222yrs306
Wind power generated in Tunisiar=0.9522yrs302
Gilead Sciences' stock price (GILD)r=0.8922yrs302
US production of butterr=0.9222yrs296
Enbridge's stock price (ENB)r=0.8922yrs292
Wind power generated in Czechiar=0.9422yrs290
US milk fat used to produce cheese (excluding cottage cheese)r=0.9222yrs286
Biomass power generated in Lithuaniar=0.9421yrs280
The Coca-Cola Company's stock price (KO)r=0.8522yrs280
US milk fat used to produce butterr=0.9222yrs276
The number of outdoor power equipment mechanics in Tennesseer=0.920yrs271
Biomass power generated in Zambiar=0.9422yrs270
Altria Group's stock price (MO)r=0.8822yrs270
US dairy skim solids used to produce whey productsr=0.9322yrs266
Kimberly-Clark's stock price (KMB)r=0.8822yrs260
Wind power generated in Falkland Islandsr=0.9322yrs259
US dairy skim solids used to produce cheese (other than cottage cheese)r=0.9222yrs254
Biomass power generated in Nigeriar=0.9322yrs249
Novartis AG's stock price (NVS)r=0.8722yrs248
US dairy skim solids used to produce butterr=0.9222yrs244
Wind power generated in Taiwanr=0.9322yrs239
Baidu's stock price (BIDU)r=0.8918yrs238
Muenster cheese consumptionr=0.9327yrs230
Chunghwa Telecom Co.'s stock price (CHT)r=0.8820yrs228
Biomass power generated in Latviar=0.9221yrs226
Kellogg's stock price (K)r=0.8722yrs218
Biomass power generated in Malawir=0.9122yrs216
Public Storage's stock price (PSA)r=0.8622yrs207
Biomass power generated in Mozambiquer=0.9122yrs206
US average milk-fat content of dry milk products (net)r=0.9222yrs203
Realty Income's stock price (O)r=0.8622yrs197
Solar power generated in Greecer=0.9318yrs195
US average milk-fat content of yogurt, nonfrozenr=0.9222yrs193
PPG Industries' stock price (PPG)r=0.8622yrs187
Gasoline pumped in Micronesiar=0.9222yrs184
US average dairy skim-solid content of fluid beverage milkr=0.9122yrs182
Simon Property Group's stock price (SPG)r=0.8522yrs176
US average milk-fat content of cheese (other than cottage cheese)r=0.922yrs170
BCE Inc.'s stock price (BCE)r=0.8622yrs166
US average dairy skim-solid content of cheese (other than cottage cheese)r=0.922yrs160


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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.)
Error :(