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

VariableCorrelationYearsHas img?
Nuclear power generation in Iranr=0.9711yrsNo
The number of dental hygienists in Texasr=0.9520yrsNo
The number of salespeople in Texasr=0.920yrsNo


Air quality in Houston also correlates with...

VariableCorrelationYearsSys. Score
Biomass power generated in Papua New Guinear=0.9322yrs379
Biomass power generated in Zambiar=0.9122yrs376
China's Annual Passenger Car Productionr=0.9318yrs374
The number of dietitians and nutritionists in Texasr=0.9220yrs374
The number of cardiovascular technicians in Texasr=0.9220yrs374
US household spending on rented dwellingsr=0.923yrs354
US average dairy skim-solid content of yogurt, nonfrozenr=0.9122yrs352
Wind power generated in Bulgariar=0.9318yrs345
The number of registered nurses in Texasr=0.9218yrs342
US production of dry milk products (net)r=0.8822yrs340
Google searches for 'two day shipping'r=0.8820yrs340
Google searches for 'scooby doo where are you'r=0.8820yrs340
Google searches for 'how to make baby'r=0.8820yrs340
U.S. direct investment abroadr=0.8622yrs338
US dairy skim solids used to produce dry milk productsr=0.8822yrs338
Percentage of Americans with social media profilesr=0.914yrs336
US Biomass Energy Productionr=0.8817yrs335
Total Revenue of the NFL Teamsr=0.8520yrs334
Revenue of US Broadcasting Industryr=0.8717yrs334
Gasoline pumped in Timor-Lester=0.9319yrs333
The number of production, planning, and expediting clerks in Texasr=0.9120yrs332
Petroluem consumption in Timor-Lester=0.9219yrs322
US household spending on healthcarer=0.8823yrs321
US household spending on health insurancer=0.8823yrs321
The number of paralegals in Texasr=0.918yrs320
Total likes of SciShow Space YouTube videosr=0.8910yrs306
Number of Walmart stores worldwider=0.8615yrs303
Global sales revenue of elevators and escalatorsr=0.97yrs294
Global revenue from elevator and escalator salesr=0.97yrs290
US average milk-fat content of dry milk products (net)r=0.8722yrs286
Viewership of "The Big Bang Theory"r=0.8812yrs284
Wind power generated in Czechiar=0.8922yrs283
US average dairy skim-solid content of yogurt, nonfrozenr=0.8722yrs276
Patents granted to International Business Machinesr=0.8512yrs276
Wind power generated in Tunisiar=0.8922yrs273
The number of urban planners in Texasr=0.8920yrs270
Wind power generated in Falkland Islandsr=0.8822yrs262
The number of hotel desk clerks in Texasr=0.8920yrs260
Biomass power generated in Latviar=0.8921yrs252
The number of insurance appraisers, auto damage in Texasr=0.8820yrs248
Biomass power generated in Lithuaniar=0.8921yrs242
The number of office clerks in Texasr=0.8820yrs238
Global Apple iPhone Sales in Q3r=0.8912yrs232
Biomass power generated in Indiar=0.8723yrs231
The number of respiratory therapists in Texasr=0.8720yrs226
Total annual sales revenue of Ford Motors in Canadar=0.8319yrs226
Number of Public Library Members in the UKr=0.8712yrs225
Biomass power generated in Nigeriar=0.8722yrs220
Adidas Group's Global Net Salesr=0.7923yrs220
The number of surgical technologists in Texasr=0.8720yrs216
Number of edits to the Wikipedia article for Dunning Kruger effectr=0.818yrs214
GMO use in cotton in Texasr=0.8223yrs210
Fomento Econ's stock price (FMX)r=0.7822yrs210
Customer satisfaction with Motorolar=0.818yrs210
Customer satisfaction with AT&Tr=0.818yrs210
Solar power generated in Greecer=0.8818yrs208
GMO use in cottonr=0.8123yrs208
Verizon Communications' stock price (VZ)r=0.7722yrs208
US household spending on fresh fruitsr=0.8323yrs208
Altria Group's stock price (MO)r=0.7622yrs207
The number of chemical equipment operators and tenders in Texasr=0.8720yrs206
The distance between Saturn and Mercuryr=0.6644yrs206
Annual US household spending on educationr=0.8221yrs205
Customer satisfaction with American Airlinesr=0.6928yrs204
Annual US household spending on health insurancer=0.823yrs204
US household spending on fresh vegetablesr=0.823yrs204
Wind power generated in Lithuaniar=0.8818yrs198
Google searches for 'headache remedies'r=0.8420yrs198
The number of statisticians in Texasr=0.8520yrs195
Google searches for 'how to make baby'r=0.8420yrs188
Wind power generated in Taiwanr=0.8522yrs187
The number of clergy in Texasr=0.8620yrs185
US production of cheese (other than cottage cheese)r=0.8422yrs179
Biomass power generated in Burmar=0.8817yrs176
Simon Property Group's stock price (SPG)r=0.7522yrs176
The number of occupational therapists in Texasr=0.8620yrs175
US production of whey products (net)r=0.8422yrs169
The number of financial services sales agents in Texasr=0.8620yrs165
Liquefied petroleum gas used in Maldivesr=0.8818yrs164
Dominion Energy's stock price (D)r=0.7422yrs164
US milk fat used to produce cheese (excluding cottage cheese)r=0.8422yrs159
Google searches for 'i have the flu'r=0.7620yrs156
The number of brokerage clerks in Texasr=0.8620yrs155
US milk fat used to produce dry milk productsr=0.8422yrs149
US Tree Nut Consumption per Personr=0.8422yrs149
The number of accountants and auditors in Texasr=0.8520yrs144
US production of sour creamr=0.8322yrs138
US milk fat used to produce yogurtr=0.8322yrs128
Biomass power generated in Solomon Islandsr=0.8716yrs124
US dairy skim solids used to produce cheese (other than cottage cheese)r=0.8422yrs118
US dairy skim solids used to produce whey productsr=0.8422yrs108
US dairy skim solids used to produce yogurt, nonfrozenr=0.8422yrs98
US production of butterr=0.8122yrs84
US milk fat used to produce butterr=0.8122yrs74
US dairy skim solids used to produce butterr=0.8122yrs63
Hydopower energy generated in Sierra Leoner=0.8422yrs40
US average milk-fat content of cheese (other than cottage cheese)r=0.8522yrs38
US average dairy skim-solid content of cheese (other than cottage cheese)r=0.8322yrs24


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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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