Indicative of the importance of different chemicals interacting to cause smog, is the term photochemical smog.    From Wordnik.com.  [Smog] Reference

Because this type of smog forms when chemical reactions take place in the presence of sunlight, it is termed photochemical smog.    From Wordnik.com.  [QCOnline Metro News] Reference

They contribute to the formation of photochemical smog.    From Wordnik.com.  [AP Environmental Science Chapter 16- Air, Water and Soils] Reference

Elemental fluxes will increase via photochemical pathways.    From Wordnik.com.  [Key findings, science gaps, and recommendations for freshwater ecosystems in the ACIA] Reference

I look upon the primary photochemical processes as something.    From Wordnik.com.  [Max Delbrück - Nobel Lecture] Reference

Most of this ozone is created as a byproduct of human-created photochemical smog.    From Wordnik.com.  [Atmospheric composition] Reference

Ozone is an important tracer of photochemical processes in the atmosphere of Mars.    From Wordnik.com.  [Ozone on Mars: Two Windows Better Than One | Universe Today] Reference

More information on photochemical smog in the US can be found at a relevant EPA site.    From Wordnik.com.  [Smog] Reference

Other photochemical reactions, though, that aren't so high energy, could also be useful.    From Wordnik.com.  [Analog Science Fiction and Fact]

photochemical oxidants are primarily produced during the formation of photochemical smog.    From Wordnik.com.  [AP Environmental Science Chapter 16- Air, Water and Soils] Reference

Like certain light wavelengths, it has a strong photochemical action, causes phosphorescence, etc.    From Wordnik.com.  [Nobel Prize in Physics 1903 - Presentation Speech] Reference

Fantasy trilogies sell better than photochemical smog science fantasy horror novels i.e. my second novel SunSmoke.    From Wordnik.com.  [Stories You'll Never Read] Reference

The primary photochemical step, when we perceive light, is a cis-trans conversion around a double bond in retinal.    From Wordnik.com.  [Press Release: The 1999 Nobel Prize in Chemistry] Reference

In 1925, he proposed a mechanism to explain his observations of the photochemical dissociation of iodine molecules.    From Wordnik.com.  [James Franck - Biography] Reference

These materials find applications in information technology, photochemical energy conversion and biomedical devices.    From Wordnik.com.  [Hydrocarbons for the 21st Century - The Work of the Loker Hydrocarbon Research Institute] Reference

Ultraviolet radiation also affects many photochemical reactions, such as the formation of ozone in the lower atmosphere.    From Wordnik.com.  [Why assess the impacts of changes in climate and UV radiation in the Arctic] Reference

The hourly internationally acceptable limit for photochemical smog had been exceeded four times on two days in Cape Town from.    From Wordnik.com.  [ANC Daily News Briefing] Reference

There are three ways pesticides are degraded in the soil: biodegradation, chemical degradation, and photochemical degradation.    From Wordnik.com.  [AP Environmental Science Chapter 16- Air, Water and Soils] Reference

Likewise, chemical energy could also have provided initial energy; with a switch to other forms photochemical, etc coming later.    From Wordnik.com.  ['Primordial Soup' Ousted from the Origin of Life?!? - The Panda's Thumb] Reference

This is just the chemistry part, of course, and the rest of photochemical modeling also has a lot of physics and mechanics in it.    From Wordnik.com.  [Archive 2007-02-01] Reference

The solvents that evaporate from paint have been identified as major contributors to photochemical smog in California and elsewhere.    From Wordnik.com.  [16: Oils] Reference

Puralytics, winner of this year's CleanTech Open, uses photochemical processes work to break down or remove contaminants from water.    From Wordnik.com.  [Andrew Winston: Innovation in Managing Water] Reference

The question we were working on was the photooxidation of toluene used as a solvent and a component of gasoline in photochemical smog.    From Wordnik.com.  [The Scientific Method] Reference

The investigation of the electronic, photoelectric and photochemical behaviour of such materials now occupies a good fraction of his time.    From Wordnik.com.  [Melvin Calvin - Biography] Reference

A good example is provided by abatement measures for photochemical smog, with ozone and peroxyacyl nitrates (PAN) as important secondary products.    From Wordnik.com.  [Air pollution emissions] Reference

This diabatic circulation also distributes ozone to lower altitudes in the high latitude regions, where, owing to a longer photochemical lifetime, it accumulates.    From Wordnik.com.  [Factors affecting arctic ozone variability in the Arctic] Reference

Roscoe a series of investigations on photochemical measurements, which W. Ostwald has called the "classical example for all future researches in physical chemistry.".    From Wordnik.com.  [Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"] Reference

Ozone concentrations were observed to be regionally enhanced by photochemical activity in continental air masses passing through areas with high nitrogen oxides emissions.    From Wordnik.com.  [Chapter 8] Reference