1977

Optical attenuation method developed

1979

Aethalometer concept developed; research prototype

198O

First field test, first publication

1980

Measurements of BC at remote locations as tracer for long-range atmospheric circulation

1986

Recognition of importance of BC as tracer for the adverse health effects of diesel exhaust

1996

Manufacturing starts in Slovenia under OEM contract: AE16 (1 wavelength); AE21 (2 wavelengths); AE31 (7 wavelengths)

2OOO

Recognition of importance of BC aerosols for climate change forcing

2OO1

US EPA / ETV approval of AE31 Aethalometer

2OO7

Aerosol Co. founded in Slovenia for development of Aethalometers

2OO9

Development of “MicroAeth”