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

VariableCorrelationYearsHas img?
Google searches for 'my cat scratched me'r=0.9216yrsNo
Google searches for 'i have a headache'r=0.9220yrsNo
Walmart's stock price (WMT)r=0.9222yrsYes!
AstraZeneca's stock price (AZN)r=0.922yrsNo
Consumption of dry whole milk productsr=0.7432yrsNo


Air quality in Pittsburgh also correlates with...

VariableCorrelationYearsSys. Score
The Coca-Cola Company's stock price (KO)r=0.922yrs398
Amgen's stock price (AMGN)r=0.9322yrs398
Total length of SmarterEveryDay YouTube videosr=0.9317yrs398
Average length of SmarterEveryDay YouTube videosr=0.9117yrs396
xkcd comics published about sciencer=0.9317yrs378
Solar power generated in Cubar=0.9123yrs377
Google searches for 'no cap'r=0.9120yrs374
Google searches for 'buy a house'r=0.9120yrs374
Vertex Pharmaceuticals' stock price (VRTX)r=0.9322yrs368
The average number of likes on SmarterEveryDay YouTube videosr=0.8717yrs360
Fiserv's stock price (FI)r=0.9322yrs358
US household spending on home maintenancer=0.923yrs354
CGI Inc.'s stock price (GIB)r=0.9322yrs348
Solar power generated in Perur=0.922yrs344
Wind power generated in Moroccor=0.8822yrs342
Popularity of the 'red pill blue pill' memer=0.8718yrs342
Cost to send a letter via the USPSr=0.8817yrs341
US Wind Power Generation Capacityr=0.8723yrs340
Popularity of the 'spiderman pointing' memer=0.8618yrs340
Google's Advertising Revenuer=0.8622yrs337
Google's annual advertising revenuer=0.8622yrs337
Lockheed Martin's stock price (LMT)r=0.922yrs336
Google's Annual Global Revenuer=0.8521yrs334
Global annual electricity generationr=0.8518yrs332
Average number of comments on SmarterEveryDay YouTube videosr=0.8717yrs330
The TJX Companies' stock price (TJX)r=0.9222yrs326
Annual US household spending on home maintenancer=0.8723yrs320
Annual US household spending on meats, poultry, fish, and eggsr=0.8623yrs318
Annual US household spending on processed vegetablesr=0.8623yrs318
Ross Stores' stock price (ROST)r=0.9222yrs316
Annual US household spending on fruits and vegetablesr=0.8523yrs316
Annual US household spending on fresh vegetablesr=0.8523yrs316
US household spending on fresh vegetablesr=0.8523yrs316
Solar power generated in Luxembourgr=0.8721yrs309
HDFC Bank's stock price (HDB)r=0.9122yrs304
Google searches for 'i am dizzy'r=0.920yrs302
Solar power generated in Belgiumr=0.8818yrs298
Sysco's stock price (SYY)r=0.9122yrs294
Google searches for 'best colleges'r=0.8920yrs291
Total likes of Tom Scott's YouTube videosr=0.8815yrs289
Wind power generated in Chiler=0.8621yrs288
Xcel Energy's stock price (XEL)r=0.9122yrs284
Google searches for 'how to go to space'r=0.8920yrs281
Total comments on Steve Mould's YouTube videosr=0.8815yrs279
Solar power generated in Taiwanr=0.8622yrs278
Brown-Forman's stock price (BF.B)r=0.9122yrs274
Google searches for 'what is my zodiac sign'r=0.8820yrs270
Average length of Numberphile YouTube videosr=0.8913yrs268
Wind power generated in Croatiar=0.8718yrs266
WEC Energy Group's stock price (WEC)r=0.9122yrs264
Google searches for 'tetanus'r=0.8820yrs260
Total length of Steve Mould's YouTube videosr=0.8715yrs258
Wind power generated in Dominican Republicr=0.913yrs256
DTE Energy Company's stock price (DTE)r=0.9122yrs254
Google searches for 'adopt a cat'r=0.8820yrs250
Customer satisfaction with United Airlinesr=0.7828yrs248
The average number of likes on Tom Scott's YouTube videosr=0.8615yrs246
Solar power generated in Maldivesr=0.8717yrs245
McCormick & Company's stock price (MKC)r=0.9122yrs244
Google searches for 'takeout near me'r=0.8919yrs240
Geothermal power generated in Germanyr=0.8618yrs234
Total likes of The Game Theorists YouTube videosr=0.8515yrs234
Google searches for 'who is jk rowling'r=0.8720yrs228
Microsoft's Worldwide Earningsr=0.8421yrs228
The number of sonographers in Pennsylvaniar=0.8420yrs228
Annual Revenue of the Lego Groupr=0.8420yrs227
The number of property association managers in Pennsylvaniar=0.8420yrs227
The number of financial services sales agents in Pennsylvaniar=0.8420yrs227
Google's Net Incomer=0.8419yrs226
Honeywell International's stock price (HON)r=0.922yrs223
US production of dry milk products (net)r=0.822yrs223
US milk fat used to produce dry milk productsr=0.822yrs223
Divorce rates in the United Kingdomr=0.7133yrs222
US dairy skim solids used to produce dry milk productsr=0.822yrs222
Popularity of the first name Brittanier=0.840yrs220
Google searches for 'do i need to go to the doctor'r=0.8720yrs218
American Electric Power Company's stock price (AEP)r=0.922yrs213
Google searches for 'how to calculate a correlation'r=0.8917yrs208
Centene's stock price (CNC)r=0.922yrs203
Total length of Mark Rober YouTube videosr=0.8513yrs202
Google searches for 'how to learn python'r=0.8917yrs198
The number of pharmacists in Pennsylvaniar=0.8220yrs196
Solar power generated in Ukrainer=0.8912yrs193
Google searches for 'reddit'r=0.8916yrs187
Solar power generated in Cyprusr=0.8517yrs182
Google searches for 'cold shower'r=0.8620yrs176
Solar power generated in Indonesiar=0.8714yrs172
Google searches for 'when is new years'r=0.8620yrs166
Wind power generated in Kazakhstanr=0.8616yrs162
Google searches for 'why do i have a migraine'r=0.8620yrs156
Google searches for 'sushi near me'r=0.8620yrs146
Solar power generated in Ethiopiar=0.8614yrs110
Gasoline pumped in Djiboutir=0.7442yrs82
Biomass power generated in Lithuaniar=0.8521yrs71
Gasoline pumped in Colombiar=0.7342yrs61
Liquefied petroleum gas used in Laosr=0.7342yrs51


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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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