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. 2022 Jun 8;130(6):067001. doi: 10.1289/EHP9872

Figure 1.

Figure 1A is a box and whiskers plot, plotting Estimated Nitrogen Dioxide concentration micrograms per meter cubed), ranging from 0 to 50 in increments of 10 (y-axis) across 63 percent are Rural resident, 19 percent are rural-to-urban migrant, and 18 percent are urban resident; 27 percent are illiterate, 18 percent did not finish elementary school but can read, 21 percent finished elementary school, 21 percent finished middle school, and 13 percent finished high school and above; 45 percent do agricultural work and 55 percent do nonagricultural work; and 21 percent are less than 2,000 Yuan, 20 percent are between 2,000 and 5,500 Yuan, 21 percent are between 5,500 and 12,000 Yuan, 20 percent are between 12,000 and 24,000 Yuan, and 19 percent greater than 24,000 Yuan (x-axis) for Migration, Education, Occupation, and Household per Capita Income. Figure 1B is a box and whiskers plot, plotting Fine Particulate Matter concentration micrograms per meter cubed), ranging from 0 to 80 in increments of 20 (y-axis) across Rural resident, rural-to-urban migrant, and urban resident; illiterate, did not finish elementary school but can read, elementary school, middle school, and high school and above; agricultural work and nonagricultural work; and less than 2,000 Yuan, 2,000 to 5,500 Yuan, 5,500 to 12,000 Yuan, 12,000 to 24,000 Yuan, and 24,000 Yuan (x-axis) for Migration, Education, Occupation, and Household per Capita Income. A scale depicting household per capita income (1,000 Renminbi), ranging from 0 to 75 in increments of 25.

Estimated ambient (A) NO2 and (B) PM2.5 concentration by individual’s rural-to-urban migration status, education, occupation, and income quintile. Box and whiskers indicate the 10th, 25th, 50th, 75th, and 90th percentiles and the mean (red circle). Income levels are displayed in the lower right of (B). The percentage numbers of individuals in each subgroup are annotated at the bottom of (A). Note: NO2, nitrogen dioxide; PM2.5, fine particulate matter, RMB, Renminbi.