Table 1.	Environment Zones
Zone E1			Within "National Parks", "Areas of out- standing natural beauty" or other "dark land- scapes"
Zone E2			Within a rural location, but outside a Zone E1. (Low district brightness)
Zone E3			Within an urban location, but outside a ZoneE4. (Medium district brightness)
Zone E4			Within an urban center location (High dis- trict brightness)