There’s more to summer smog than traffic, heating and industry. Hydrocarbons are chemically reactive and can form thousands of other pollutants
The contribution of diesel exhaust to summer smog has been a topic of hot debate over the last six years.
Not all air pollution comes directly from sources such as traffic, heating and industry. Pollutants are also created from chemical reactions in the atmosphere. This is especially true in summer when stronger sunlight provides extra energy to drive the chemistry. During this July’s hot weather, air drifted over France and the UK, accumulating pollutants that then reacted in the sunshine. The resulting summertime smog reached six on the UK government’s ten point warning scale.
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Source: Guardian Environment