Summer smog is a result of a complex cocktail of noxious chemicals emitted from vehicle exhausts. On still, sunny days these react together in bright sunlight to produce yet more irritable substances, notably ozone, which constricts the lungs, causing coughing and other breathing difficulties.
Ozone at high altitudes is both natural and beneficial, acting as a shield against harmful ultraviolet radiation from space. But near the ground it is a pollutant that can cause serious health problems in high concentrations.
As the love affair with the car has blossomed (car use is expected to double in the next 30 years), smog has become a regular feature of our summers. In the past week, few parts of Britain have escaped poor air quality. London and other cities felt it most, primarily because of rising nitrogen dioxide from exhaust fumes, but rural areas also had increasing levels of ozone, building up as a result of vehicle emissions drifting across from many miles away.
Summer smog is a result of a complex cocktail of noxious chemicals emitted from vehicle exhausts. On still, sunny days these react together in bright sunlight to produce yet more irritable substances, notably ozone, which constricts the lungs, causing coughing and other breathing difficulties.Ozone at high altitudes is both natural and beneficial, acting as a shield against harmful ultraviolet radiation from space. But near the ground it is a pollutant that can cause serious health problems in high concentrations.As the love affair with the car has blossomed (car use is expected to double in the next 30 years), smog has become a regular feature of our summers. In the past week, few parts of Britain have escaped poor air quality. London and other cities felt it most, primarily because of rising nitrogen dioxide from exhaust fumes, but rural areas also had increasing levels of ozone, building up as a result of vehicle emissions drifting across from many miles away.
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