Abstract
Abstract Computer simulations have been made of the rates of chemical changes expected to occur in certain polluted atmospheres. The results point to an unexpected conclusion: Even in the absence of reactive hydrocarbons, the presence of small levels of carbon monoxide in an NO-containing atmosphere may enhance the photooxidation of NO to NO2 and may lead ultimately to significant levels of ozone. In view of the technological difficulties associated with the complete removal of NOX and CO from auto-exhaust and NOX from stack gases, significant ambient levels of ozone may be anticipated to continue to form in many urban areas even though a near total removal of the reactive hydrocarbons might be accomplished.
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