Mikrocensus 1991, 1. quarter: Extended Housing Survey, Environment

The special survey in March is on the topic of extended housing survey ("Erweiterte Wohnungserhebung"), just as in the previous years (MZ9001, MZ8901, MZ8801, ...). In addition, there are questions on environmental conditions.本次三月专项调查的主题为拓展型住房调查（Erweiterte Wohnungserhebung），与往年开展的MZ9001、MZ8901、MZ8801等系列调查一致。此外，本次调查还设置了环境状况相关问题。