Sunlight Activates Urban Grime

Sept. 23, 2015
Natural sunlight triggers smog-forming compounds from the grime that coats outdoor surfaces in urban areas.

As if the grime so common to buildings, statues and other outdoor surfaces in urban areas isn’t bad enough, it gets even worse when exposed to sunlight. Researchers from the University of Toronto have determined that the sun triggers the release of smog-forming nitrogen oxide compounds from urban grime, according to an article at The findings dispel a long-held belief by many scientists that the nitrates become inactive when trapped in grime.

Urban grime is defined in the article as a “mixture of thousands of chemical compounds spewed into the air by automobiles, factories and a host of other sources,” with some of those compounds being nitrogen oxides. The study indicates that the current understanding of air pollution is incomplete, according to the researchers, who presented their findings at the 250th American Chemical Society National Meeting & Exposition last month.

Read the entire article here.

Sponsored Recommendations

Heat Recovery: Turning Air Compressors into an Energy Source

More than just providing plant air, they're also a useful source of heat, energy savings, and sustainable operations.

Controls for Industrial Compressed Air Systems

Master controllers leverage the advantages of each type of compressor control and take air system operations and efficiency to new heights.

Discover Your Savings Potential with the Kaeser Toolbox

Discover your compressed air station savings potential today with our toolbox full of calculators that will help you determine how you can optimize your system!

The Art of Dryer Sizing

Read how to size compressed air dryers with these tips and simple calculations and correction factors from air system specialists.