So why is the airborne photochemical smog visible, at almost all times?

A. Ozone is the kind of generic name we give for photochemical smog in the summer.

Photochemical smog is therefore considered to be a problem of modern industrialization.

And could, if levels get high enough, descend on us as choking, photochemical smog.

In 1970, 40 high school students were exposed to photochemical smog and required hospitalization.

In the 1950s the source of photochemical smog was established as automobile exhaust emissions.

Photochemical smog was first described in the 1950s.

Changing the nitrogen cycle also increases photochemical smog and acid deposition.

It is a secondary pollutant present in photochemical smog.

In the murk of photochemical smog, her suit lights penetrated barely a few feet.

Particulates created from gaseous primary pollutants and compounds in photochemical smog.

The noxer blocks aim to reduce these pollution levels and therefore lower the amount of photochemical smog.

Examples of problems which have been addressed by atmospheric chemistry include acid rain, photochemical smog and global warming.

Ozone levels are significantly increased, thereby increasing photochemical smog and aggravating medical problems such as asthma.

Huge low pressure systems in the photochemical smog spiraled around the world, and small, high clouds scudded across the stratosphere.

This reaction is similar to the photochemical smog that forms from unburnt hydrocarbon emissions around cars etc.

The worst problems are ozone (the major constituent of photochemical smog), carbon monoxide and fine particulates.

These gases are toxic and damage human health; the second also contributes to acid rain and the last is the main cause of photochemical smog.

The brownish photochemical smog that hangs over Los Angeles and many other cities is created primarily by motor vehicles.

See photochemical smog.

It can be triggered by irritants in the air, photochemical smog for example, as well as substances that a person is allergic to.

The foundation financed, among other things, an auditorium, the interdisciplinary Beckman Institute and research on the causes of photochemical smog.

There was still dust here, dust and lung-crippling clouds of photochemical smog from cars and trucks.

The air quality over much of Britain deteriorated during hot weather in May, with a build up of photochemical smog in some areas.

Over the evening most if not all, of the photochemical smog (haze) that seems to cover most of the country will have reverted to transparency.