Photochemical smog is a mixture of air pollutants formed by the reaction of nitrogen oxides and volatile organic hydrocarbons (VOC) under the influence of sunlight. There are several factors contributing to the photochemical smog over Cincinnati. Car exhaust, industry, coal-burning, gas-powered lawn equipment, paints and boats on the the Ohio River are some of the major contributors with car exhaust contributing 44% alone. Oak trees in the surrounding hills emit high levels of VOCs which are ingredients in the development of the smog. Photochemical smog has many harmful effects to human health and the health of other living organisms but it also increases the rate of destruction of buildings, metals and rubbers.
Water pollution in Cincinnati is just as harmful. The Ohio River ranks number three on the list of the most polluted waters in the United States. One of the