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Air and Climate Change Research

Optimized Noise-Reduction Algorithm (ONA) for the Aethalometer

ONA is a data post-processing tool to reduce noise in real-time Aethalometer black carbon data through variable time averaging of the data. This is a research tool that does not imply EPA endorsement of a commercial product nor a quality review of black carbon data.


Version 0.0
Release Date August 2011
Development Status general release
Development Information n/a
Operating System Windows
Development Language MATLAB
Intended Audience Scientific community
Key Words Aethalometer, black carbon
Related Document Post-processing Method to Reduce Noise while Preserving High Time Resolution in Aethalometer Real-time Black Carbon Data (PDF) (8 pp, 312 KB)

General Purpose

The purpose of this program is to conduct variable time-averaging of black carbon data produced from the Aethalometer (Magee Scientific) in order to reduce noise in the data. The program requires that the Aethalometer data provided includes the timestamp, black carbon values, and the light attenuation (ATN) values.


Optimized Noise-Reduction Algorithm (ONA) (EXE) (160.8 MB)

Optimized Noise-Reduction Algorithm (ONA) Instruction Manual (PDF) (5 pp, 428 KB)

Optimized Noise-Reduction Algorithm (ONA) Data File (DAT) (308 KB)


Hagler, G.S.W., Yelverton, T.L.B., Vedantham, R., Hansen, A.D.A., Turner, J.R. Post-processing method to reduce noise while preserving high time resolution in Aethalometer real-time black carbon data. Aerosol and Air Quality Research, 11: 539-546.

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