The European Union (EU) Clean Air Directive is currently among the strictest acts of legislation worldwide concerning PM10 air pollution. The most visible result of the new PM10 legislation has been the rapid adoption of "Low Emission Zones" (LEZs), which define areas that vehicles may enter...

Until recently, ISI Thompson's Web of Science-Social Sciences Citation Index was the only rigorous tool for tracking citation counts of academic research papers. The recent emergence of Google Scholar provides an alternative measure for tracking citation counts for refereed journal articles,...

Economists are increasingly using weather data and climate model output in analyses of the economic impacts of climate change. This article introduces weather data sets and climate models that are frequently used, discusses the most common mistakes economists make in using these products, and...