Replication Data for: Environmental Pressure Group Strength and Air Pollution: An Empirical Analysis (with Seth Binder), Ecological Economics, 55 (4), 2005, pp. 527-538

There is an established theoretical and empirical case-study literature arguing that environmental pressure groups have
a real impact on pollution levels. Our original contribution to this literature is to provide the first systematic quantitative
test of the strength of environmental non-governmental organizations (ENGOs) on air pollution levels. We find that
ENGO strength exerts a statistically significant impact on sulfur dioxide, smoke and heavy particulates concentration
levels in a cross-country time-series regression analysis. This result holds true both for ordinary least squares and randomeffects
estimation. It is robust to controlling for the potential endogeneity of ENGO strength with the help of instrumental
variables. The effect is also substantively important. Strengthening ENGOs represents an important strategy by which aid
donors, foundations, international organizations and other stakeholders can try to achieve lower pollution levels around
the world.