Table 1:

Pollution Per Well and Tertiles Aggregated to Zip Code 2011–2015

	(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
	CO	CO	NO_x	NO_x	PM₂.5	PM₂.5	SO_x	SO_x	VOC	VOC

# wells	0.526^***		2.048^***		0.0639^***		0.0325^***		0.172^***
	(0.0567)		(0.171)		(0.00543)		(0.00500)		(0.0597)
3–5 wells		3.271		13.28		0.395		0.514^**		1.074
		(2.928)		(9.060)		(0.289)		(0.256)		(3.042)
6–13 wells		13.30^***		45.02^***		1.472^***		1.271^***		3.835
		(3.305)		(10.23)		(0.326)		(0.289)		(3.434)
14–213 wells		27.47^***		89.83^***		2.630^***		1.777^***		9.023^**
		(3.934)		(12.17)		(0.388)		(0.344)		(4.087)
log prod	0.552^***	0.443^**	1.806^***	1.627^***	0.0633^***	0.0598^***	0.0336^**	0.0241	0.281	0.247
	(0.193)	(0.202)	(0.580)	(0.626)	(0.0185)	(0.0200)	(0.0170)	(0.0177)	(0.203)	(0.210)
Observations	1,172	1,172	1,172	1,172	1,172	1,172	1,172	1,172	1,172	1,172
R-squared	0.697	0.688	0.730	0.707	0.724	0.699	0.500	0.494	0.651	0.650

Dep. Var Mean	15.35	15.35	45.85	45.85	1.482	1.482	0.507	0.507	8.742	8.742

Notes: Data are from the PA DEP Air Emissions Inventory for Unconventional Natural Gas Operations 2011–2015. Units are tons/year. Emissions are aggregated to zip code-year. Regressions include year and zip code fixed effects. First column for each pollutant is number of reported wells in that zip code-year. Second column provides tertile estimates.

Significance:

*p<0.10,

^**

p<0.05,

^***

p<0.01.