Assertion: nitric oxide | /r/HasProperty | measured in urban area air
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text: Nitric oxide is a component of smog that can be measured in urban area air at 10 to 100 parts per billion (ppb), is naturally produced in the body in the upper and lower airway at 100 to 1000 ppb, and is present in cigarette smoke at 400 to 1000 parts per million (ppm).