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<br /> <br />Division: Air Pollution Control Division <br />James H. Lents~ Director <br /> <br />D. OZONE EXPOSURE <br /> <br /> <br /> <br />O~"T <br />(."0 <br /> <br />Ozone (03) is a highly reactive forllli of oxygen having a bluish color and JMUl&ent odor. It is a ..jor component of photochea1c:ally induced <br />smog. Its precursors are oxides of nitrogen and hydrocarbons. 'lbese are produced by numerous mobile and stationary sources including gasoline <br />terminals~ combustion sources and ma1:erIal coating -operations. Ozone affects the respi.ratory system in huaans and has an affect On the growth <br />of plants. lIigh ambient concentrations can aggravate asthma~ impair IUllg functions in bronchitis- pat1ent.~ irritate eyes, cause headaches and <br />dry out mucus producing membranes. <br /> <br />Ambient oxidant concentrations have been repor1:ed In association with aggravation of asthma, impairaeut o-f lung function in chronic bronehltia <br />subject8~ interference with track performance of high school students" eye ,and respiratory Irritation and headache~ and increased frequency of <br />motor vehicle acciden1:s. Selected examples of hea1th effects related to photochelll1cal oxidants at various ambient concentrations are <br />summarized in Table II-3. Welfare impacts include daJlage to ozone- sensitive materials such as rubber and plastic products to crop los8 iu <br />sensitive species. <br /> <br />TABLE 1I-3 <br /> <br />ESTIMATED HEALTH EFFECTS LEVELS FOil DZONE COXIDENT) EXPOSURE <br /> <br />EFFECTS <br /> <br />I~ng function parameters correlated with <br />concentrations over the range of 0.01-0.30 PPM. <br />Decreased athletic performance above 0.15 PPM. <br />Increased rates of respiratory symptoms and <br />headache above 0.16 PPH orldent levels. <br />Subjective symptoms of discomfort observed <br />with discernable changes in respiratory <br />pattern during exercise. <br /> <br />EXPOSUIlE DURATION <br /> <br />0.10-0./30 PPH for 1-2 Hours <br /> <br />Reduction In visual acuity. Some studies showed <br />moderate -lung function cbanges. Increased <br />asthma attack rates at higher levels. <br /> <br />0.20-0.25 PPK for 2-4 Hours <br /> <br />-Z2- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />.. <br /> <br />- <br /> <br />- <br /> <br />.. <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />.. <br />