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Data source: Environmental Protection Agency
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Air quality in Gettysburg, Pennsylvania correlates with...

VariableCorrelationYearsSys. Score
Average milk produced per cow in the USr=0.8633yrs371
Customer satisfaction with Appler=0.8628yrs364
Google searches for 'i have the flu'r=0.8820yrs360
Electricity generation in Saint Kitts and Nevisr=0.8832yrs352
Electricity generation in Antigua and Barbudar=0.8732yrs350
Electricity generation in Argentinar=0.8732yrs350
USA Populationr=0.8633yrs348
US milk fat used to produce sour creamr=0.8822yrs340
Hollister retail store count worldwider=0.8623yrs338
US production of yogurt, nonfrozenr=0.8722yrs338
Google searches for 'headache remedies'r=0.8620yrs336
China's Annual Passenger Car Productionr=0.8618yrs333
Number of public school students in 12th grader=0.8633yrs331
Popularity of the first name Lucyr=0.8933yrs331
Popularity of the first name Laylar=0.8933yrs331
Popularity of the first name Lucasr=0.8833yrs330
GMO use in cornr=0.8724yrs326
Customer satisfaction with TJ Maxxr=0.8814yrs324
Biomass power generated in Belgiumr=0.8732yrs320
Electricity generation in Brazilr=0.8732yrs310
US dairy skim solids used to produce sour creamr=0.8822yrs308
Renewable energy production in Brazilr=0.8732yrs300
Popularity of the first name Naomir=0.8833yrs300
US milk fat used to produce whey products (net)r=0.8622yrs297
Total viewership of the Aviva Premiership Rugby finalr=0.8614yrs296
Electricity generation in Cabo Verder=0.8732yrs290
Popularity of the first name Rubyr=0.8833yrs290
US milk fat used to produce yogurtr=0.8622yrs287
Fossil fuel use in Egyptr=0.8732yrs280
Popularity of the first name Lilianar=0.8833yrs280
Yogurt consumptionr=0.8732yrs276
Electricity generation in Gambiar=0.8732yrs270
Popularity of the first name Andersonr=0.8833yrs270
Fossil fuel use in Gambiar=0.8732yrs260
Popularity of the first name Presleyr=0.8833yrs260
Total number of automotive recallsr=0.7933yrs254
Biomass power generated in Hungaryr=0.8732yrs250
Popularity of the first name Harmonyr=0.8833yrs250
Number of Lawyers in the United Statesr=0.8533yrs249
Automotive recalls for issues with the Electrical Systemr=0.7533yrs246
Customer satisfaction with Costcor=0.822yrs244
Number of households headed by single fathers in the United Statesr=0.8532yrs242
Geothermal power generated in Icelandr=0.8732yrs240
Popularity of the first name Juder=0.8833yrs240
Patents granted in the USr=0.831yrs240
Automotive recalls for issues with the Power Trainr=0.7133yrs240
Intel Corporation's annual revenuer=0.8333yrs238
Annual Revenue of Walt Disney Companyr=0.8132yrs238
Hotdogs consumed by Nathan's Hot Dog Eating Competition Championr=0.7933yrs238
Total Sales at Clothing and Accessories Storesr=0.8131yrs236
Total number of live births in Australiar=0.8133yrs236
Inflation in the USr=0.8331yrs236
Patents granted in the USr=0.7931yrs235
Electricity generation in Kiribatir=0.8732yrs230
Budget for largest movie productionr=0.7533yrs230
Popularity of the first name Josiahr=0.8733yrs228
UFO sightings in Pennsylvaniar=0.7232yrs228
Google searches for 'how to make baby'r=0.8420yrs228
The number of economists in Pennsylvaniar=0.8520yrs228
The number of college psychology teachers in Pennsylvaniar=0.8220yrs224
The number of physical therapists in Pennsylvaniar=0.8220yrs224
Electricity generation in Kuwaitr=0.8732yrs220
Number of public school students in 11th grader=0.8233yrs220
The distance between Neptune and Uranusr=0.8234yrs220
Popularity of the first name Genesisr=0.8733yrs218
Number of highschoolers in the USr=0.7933yrs216
Biomass power generated in Swedenr=0.8732yrs210
Popularity of the first name Vivianr=0.8733yrs208
Electricity generation in Trinidad and Tobagor=0.8732yrs200
Popularity of the first name Braxtonr=0.8733yrs198
Petroluem consumption in Moroccor=0.8932yrs190
Popularity of the first name Geneviever=0.8733yrs188
Annual count of part-time employees in the United Statesr=0.8133yrs186
Number of internet usersr=0.8524yrs181
Gasoline pumped in Sao Tome and Principer=0.8932yrs180
Popularity of the first name Edenr=0.8733yrs178
Number of Registered Vehicles in the USr=0.8232yrs176
Total hydopower energy generated globallyr=0.8632yrs168
Popularity of the first name Mosher=0.8733yrs168
Gender pay gap in the U.S.r=0.7732yrs167
Super Bowl TV viewershipr=0.7633yrs162
Biomass power generated in Austriar=0.8632yrs158
Popularity of the first name Lianar=0.8733yrs158
US dairy skim solids used to produce yogurt, nonfrozenr=0.8422yrs158
Gasoline Prices in the USr=0.7733yrs157
US Annual Tax Revenuer=0.7932yrs152
Popularity of the first name Ibrahimr=0.8733yrs148
U.S. direct investment abroadr=0.8222yrs143
US dairy skim solids used to produce evaporated and condensed milkr=0.822yrs142
Popularity of the first name Liar=0.8733yrs138
US Shoe Store Salesr=0.7730yrs136
Italian-type cheese consumptionr=0.8427yrs132
Total budget of Marvel comic-based films releasedr=0.7333yrs131
Economic output of Washington metro arear=0.8221yrs125
Milk-fat consumptionr=0.832yrs120
Christmas Price Index in the United Statesr=0.7431yrs118
Number of firearms manufactured in the USr=0.7132yrs110
Hispanic cheese consumptionr=0.8426yrs110
Mozzarella cheese consumptionr=0.8327yrs100
Butter consumptionr=0.7932yrs89
American cheese consumptionr=0.7732yrs76


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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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