Table 1:
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | |
---|---|---|---|---|---|---|---|---|---|---|
CO | CO | NOx | NOx | PM2.5 | PM2.5 | SOx | SOx | 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.