ABSTRACT
Historically, a general law approach to air quality concerns has been taken. Outright prohibitions against certain activities generating air contaminants have been adopted for centuries, beginning as early as the 13th century (see Chapter 1). These prohibitions were for those actions that harmed, or that potentially harmed, the health or safety of the citizenry. At present, many international efforts are being attempted to control criteria emissions, as well as hazardous air pollutants, utilizing treaties among nations.
