# # PM2.5 and BC Concentration at UNR Physics


PM2.5 aerosol mass concentration obtained from aerosol light scattering at 532 nm
divided by a mass scattering efficiency factor of 3.8 m2/gram. Data from the photoacoustic
instruments operated by Pat Arnott from the 4th floor of Physics, UNR.
Archive data. Image automatically updates every 2 minutes.


Black carbon (BC) mass concentration obtained from aerosol light absorption
at 532 nm divided by a mass absorption efficiency factor of 8.8 m2/gram. Data from
the photoacoustic instruments operated by Pat Arnott from the 4th floor of Physics, UNR.
Archive data. Image automatically updates every 2 minutes.

 

The rationale for using these optical measurements to estimate PM2.5 and BC mass concentration is discussed in our paper.
The EPA PM2.5 standard is discussed here.
Salt Lake City has PM2.5 issues and has a good discussion (by the Atmospheric Science program at the University of Utah.)
There currently is no separate standard for BC.

Highlighted Days


Here is the PM2.5 from the King Fire on the day of maximum concentration in Reno. This day had higher PM2.5 concentration than any during the Rim fire of 2013 or during July 2008 when fires from Northern CA were intense. We have published a study of the 2008 fire season as noted here.


BC mass concentration during the King Fire. Note that the amount of black carbon produced by the smoke is much less than the total PM2.5. The health rating for BC is currently unknown so the same rating as for total PM2.5 was used.