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Data source: Environmental Protection Agency
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Air quality in Kalispell, Montana correlates with...

VariableCorrelationYearsSys. Score
Asthma prevalence in American childrenr=0.6317yrs152
Hydopower energy generated in Syriar=0.5635yrs152
Nuclear power generation in Belgiumr=0.5435yrs148
Nuclear power generation in Taiwanr=0.5335yrs147
Asthma attacks in American childrenr=0.5423yrs144
Customer satisfaction with Dollar Generalr=0.6214yrs144
Dried manure used for fertilizer in the USr=0.5729yrs140
Visitors to SeaWorld Floridar=0.5615yrs138
Asthma attacks in American childrenr=0.523yrs138
Customer satisfaction with Kohl'sr=0.5419yrs138
Customer satisfaction with Whirlpoolr=0.4828yrs138
Asthma prevalence in American childrenr=0.5317yrs137
The divorce rate in Montanar=0.5123yrs137
Asthma prevalence in American childrenr=0.5217yrs136
US music album salesr=0.6816yrs134
Customer satisfaction with CNN.com (AT&T)r=0.5120yrs134
xkcd comics published about childhoodr=0.6317yrs134
Telefónica's stock price (TEF)r=0.522yrs133
Asthma prevalence in American childrenr=0.517yrs132
Asthma prevalence in American childrenr=0.517yrs132
The number of transportation inspectors in Montanar=0.6419yrs131
Customer satisfaction with Targetr=0.5117yrs131
Asthma attacks in American childrenr=0.4523yrs131
Popularity of the first name Kendellr=0.5736yrs131
Customer satisfaction with ABCNews.comr=0.4820yrs130
How geeky OverSimplified YouTube video titles arer=0.87yrs129
Total comments on The Game Theorists YouTube videosr=-0.7615yrs128
How good CGP Grey YouTube video titles arer=0.7513yrs128
US production of fluid beverage milkr=0.5922yrs126
US dairy skim solids used to produce milk fat and skim solids byproduct fluid beverage milkr=0.622yrs126
Automotive recalls issued by Mercedes-Benz USAr=-0.5536yrs126
Customer satisfaction with FOXNews.comr=0.5812yrs126
Google searches for 'call of duty'r=0.5720yrs123
Cigarette Smoking Rate for US adultsr=0.5721yrs122
National Lacrosse Champions' Final Pointr=0.5425yrs122
Google searches for 'life insurance quotes'r=0.5620yrs122
Google searches for 'Matt Parker'r=0.5817yrs122
The number of lifeguards and ski patrol in Montanar=0.5819yrs122
The number of physical therapist aides in Montanar=0.5720yrs121
Number of Portugal matches played by Cristiano Ronaldor=0.5420yrs117
Google searches for 'report UFO sighting'r=0.4920yrs117
Viewership count of American Idol Season Finaler=0.4821yrs114
United States' Fruit Juice Export Volumer=0.5713yrs114
Visitors to SeaWorld Californiar=0.4615yrs114
Number of goals scored by Wayne Rooney in the English Premier Leaguer=0.519yrs110
Academy Awards Ceremony Audience Sizer=0.4723yrs110
Cenovus Energy's stock price (CVE)r=0.4614yrs109
Brick cheese consumptionr=0.5227yrs108
Master's degrees awarded in Philosophy and religious studiesr=0.6610yrs108
The number of movies Kevin Spacey appeared inr=0.4537yrs108
Popularity of the first name Allysonr=0.5136yrs107
Popularity of the first name Jordenr=0.536yrs106
Average SAT score in critical readingr=-0.5333yrs106
GMO use in cottonr=0.5523yrs104
Automotive recalls issued by Volkswagen Group of Americar=-0.4736yrs104
The number of movies Penelope Cruz appeared inr=0.4632yrs104
Delta Airlines' stock price (DAL)r=-0.6816yrs102
Fossil fuel use in North Macedoniar=0.5430yrs98
Kerosene used in Djiboutir=0.5235yrs88
Google searches for 'xkcd'r=0.5517yrs87
The number of procurement clerks in Montanar=0.5420yrs87
How cool CGP Grey YouTube video titles arer=0.6813yrs87
Liquefied petroleum gas used in Kyrgyzstanr=-0.6930yrs78
The number of machinists in Montanar=0.5420yrs77
Google searches for 'download firefox'r=0.5220yrs76
Sherbet consumptionr=0.4732yrs76
Popularity of the first name Mollier=0.4936yrs74
How clickbait-y OverSimplified YouTube video titles arer=0.747yrs70
Kerosene used in Sri Lankar=0.5235yrs68
Popularity of the first name Elyssar=0.4936yrs64
Google searches for 'Britney Spears'r=0.5216yrs62
The number of postmasters in Montanar=0.5120yrs62
Average number of comments on PBS Space Time YouTube videosr=0.469yrs60
Kerosene used in Tanzaniar=0.5235yrs58
Popularity of the first name Kayler=0.4936yrs54
Google searches for 'desktop background'r=0.5217yrs52
The number of forest conservation technicians in Montanar=0.5118yrs50
How professional-sounding CGP Grey YouTube video titles arer=0.6313yrs50
Liquefied petroleum gas used in Australiar=0.5136yrs47
Google searches for 'how to do magic'r=0.520yrs42
Popularity of the first name Jazminer=0.4836yrs42
Average number of comments on The Game Theorists YouTube videosr=-0.7115yrs38
Fossil fuel use in Netherlands Antillesr=0.4935yrs36
The number of counter and rental clerks in Montanar=0.4720yrs36
Popularity of the first name Brennanr=0.4836yrs32
Google searches for 't-rex'r=0.4920yrs31
Total comments on AsapSCIENCE YouTube videosr=-0.7312yrs27
Kerosene used in Indiar=0.5135yrs26
The number of postal service machine operators in Montanar=0.4720yrs26
Google searches for 'matt parker'r=0.4820yrs20
The number of human resources assistants in Montanar=0.4620yrs15
How fun CGP Grey YouTube video titles arer=0.5913yrs14
Electricity generation in Djiboutir=0.4635yrs12
Fossil fuel use in Djiboutir=0.4635yrs2
Electricity generation in U.S. Virgin Islandsr=0.4635yrs-8
Fossil fuel use in U.S. Virgin Islandsr=0.4635yrs-18
Liquefied petroleum gas used in Kosovor=0.6214yrs-28
Liquefied petroleum gas used in Serbiar=0.6116yrs-38
Petroluem consumption in Syriar=0.4835yrs-48
Liquefied petroleum gas used in Austriar=0.4736yrs-59
Nuclear power generation in Germanyr=0.4631yrs-72


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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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