Smog and Haze

Photochemical smog is created by pollutants such as nitrogen oxides and organic compounds. These come from motor vehicles and slow combustion stoves, open fires and burning of natural vegetation. The chemicals react with bright sunlight to produce a gas called ozone. Ozone is important in the upper levels of the atmosphere, to protect us from the radiation of the sun. But when it is produced close to the ground it is a dangerous pollutant, which can cause eye and nose irritations, and even lung and heart problems.

Smog is difficult to detect because it is colourless, but mostly occurs during the hotter months. The sun shines longer and more brightly causing more chemical reactions in the atmosphere.

The easy to see brown stain that hangs over city skylines on windless days is called haze. This is a mixture of dust particles, water vapour, smoke, vehicle emissions and factory emissions. Brown haze pollutes our natural environment and can cause breathing problems for some people.

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