т 700000 620 410 420 430 440 450 460 470 480 490 500000 510 520 530 540 550 560 570 (question 32). Figure 4. Respondents who believe there is air pollution in their neighborhood 800000 410 420 430 440 450 Figure 5. Respondents who believe there is air pollution in their neighborhood and who define air pollution as "smoke" (questions 28 and 32). 2. the east and somewhat to the south of the city. The area of major concern in the Madison County area includes Alton and Edwardsville. There are pockets that appear to be significant in south and north St. Louis County, the latter near Route 70. The central business districts of St. Louis and East St. Louis, as well as a considerable section adjacent to the Mississippi River to the north, are not well defined, probably because of too few respondents. 3. Dust and dirt. Figure 6 relates responses concerning air pollution "here in this neighborhood" (question 32) to air pollution defined as "dust and dirt" (question 28). Again, the major concern was in the Illinois part of the Study area, with some areas of concern reported on the Missouri side. The central portion of the survey area is not well defined. Odors. Figure 7 relates responses concerning air pollution "here in this Air Quality Measurements Related to Public Opinion Four Questions, Four Pollutants Table 1 lists the four pollutants considered, the number of air sampling stations for both geometric means and. 99th percentiles, and the number of respondents to questions in the areas for which air quality data were available. Tables 2 through 5 report the results of the comparison in detail, and Table 6 summarizes Tables 2 through 5 statistically by using ratios of the regression slope to the product of the student "t" statistical test and standard error of the slope (see Appendix B for statistical criteria). The ratios (Table 6) indicate the following order of greatest to least causeand-effect relationships for the geometric means: high-volume sampler, soiling, sulfation, and sulfur dioxide volumetric measures. For the 99th percentiles the order is: high-volume sampler, sulfation, soiling, and sulfur dioxide volumetric measures. In other words, for mean pollution levels, high-volume sampler data are most closely related to opinions of the respondents, and volumetric sulfur dioxide measurements are least closely related to opinions of respondents about air pollution. These results are in general agreement with expectations with regard to the sensory perception (by sight, touch, taste, and smell) of the respondents to pollutants measured. Use of Data as an Aid in Selecting Air Quality Goals Figures 8 through 15 show in graphic form selected data from Tables 2 through 5. They show the relationship between responses to questions 27, 31, 32, and 43 and geometric mean and 99th percentile values of the four pollutant measurements. These figures can be used as an aid in selecting air quality goals insofar as those aspects of air quality that people perceive are concerned. The criteria used in selecting values from these data are subject to broad exercise of judgment. In this report the criteria 80000 70000 690 LINES OF EQUAL PERCENTS OF THOSE RESPONDENTS Figure 6. Respondents who believe there is air pollution in their neighborhood and who define air pollution as "dust and dirt" (questions 28 and 32). |