1980s: Measuring Ambient Noise on Christmas Eve, Industrial Site -- Part 2 Erkki paints a vivid picture of how environmental noise was measured in the 1980s: “A career in environmental acoustics looked very different in the 1980s and 1990s. Early noise measuring equipment had no internal memory, narrow measuring ranges, and only limited octave band capability. Longer measurements required external loggers, and even then, only one parameter per second—typically LAeq—could be