It is the exhaust from vehicles that causes most problems to eyesight. Public alarm is most often voiced over the adverse effect upon breathing, but hydrocarbons and nitric oxide in ambient air cause irritation to the eyes especially when exposed to such air pollution for up to four hours. This is the case whatever the weather temperature.
Parents are wisest to ensure their children are in areas of heavy traffic for as short a time as possible for they will not be as aware as adults of the toxic atmosphere caused by heavy traffic. Lately, drivers of vehicles have become more responsible by switching off their engines when stationary.
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