University of California

Government of the United States as Represented by the Administrator of the U.S. Environmental Protection Agency

Thomas Kirchstetter

Paul H Berdahl

Paul Alan Solomon

Hugo Destaillats

Ronnen Levinson

Hashem Akbari

Mohamad Sleiman

The invention relates to a device for measuring, in near-real-time, the level of black carbon, brown carbon, organic carbon, total carbon and COin air. The device also provides for a direct calculation of aerosol angstrom coefficient as well as estimation of emissions rates of black carbon or brown carbon from nearby combustion sources.

Air pollution sensor to measure major carbon components in the environment

This disclosure provides systems, methods, and apparatus related to simulated soiling and weathering of materials. In one aspect, a soiling mixture may include an aqueous suspension of various amounts of salt, soot, dust, and humic acid. In another aspect, a method may include weathering a sample of material in a first exposure of the sample to ultraviolet light, water vapor, and elevated temperatures, depositing a soiling mixture on the sample, and weathering the sample in a second exposure of the sample to ultraviolet light, water vapor, and elevated temperatures.

Mixture and method for simulating soiling and weathering of surfaces

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Oakland, CA, United States of America

Thomas Kirchstetter