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We were advised

The smog and smog is a term derived from English, in particular a contraction of smoke (smoke) and fog (fog) and it is just that, a sort of fog-like smoke. It is a form of air pollution, where pollutants remain in it in the lower layers of the atmosphere.

When there is large amount of pollutants in the air and is joined by a period of high pressure, contaminated air stagnates and creates this type of fog, which has nothing to do with the traditional fog formed by water particles in suspension.

can distinguish the sulfur smog or photochemical smog .

The sulfurous smog is also known as gray smog, gear, industrial, or acid rain. Coal combustion produces sulfur oxides and these, when they react with water vapor in the atmosphere, very common in cities like London fog common form sulfuric acid mist and turns in this smog laden with contaminants.

As to photochemical smog, is one that arises as a result of the combination of nitrogen oxides and volatile organic compounds (VOCs) mainly come from vehicle exhaust, this combination reacts with solar radiation, which makes these catalyze and form ozone and peroxyacyl nitrate (PAN), creating the haze dark or photochemical smog.

The most common smog in large cities is the photochemical smog, because they are highly populated areas with high pollution levels, although it is more likely to occur in those cities with a dry climate, warm, sunny with little wind, and geographic basins and ridges of mountains where these contaminants are difficult to escape due to the inversion.

The smog is reflected in human health, creating breathing problems, shortness of breath and cough. Cause irritation to mucous membranes and eyes and makes the body's ability to prevent disease impairing the defense system.

Big cities like New York, London, Mexico City, Toronto, Santiago, Chile, Beijing or Hong Kong suffer from these conditions of almost permanent.

would be interesting and necessary to implement measures to reduce this amount of pollutants into the air, above all, the emissions from vehicles using fossil fuels and a reduction of commute, a commitment to public transport and expansion of green areas and gardens in large cities can help and be effective to combat this type of pollution.