Sociology of knowledge, by examining the social impacts of ideas, the generation mechanism of ideas, and the group consciousness of ideas, provides a useful theoretical approach to the history of ideas, which emphasizes the origin, pattern, and historical process of ideas. As a type of ideographs elaborately constructed by scientific discourses, the emergence of PM2.5 symbolizes a far-reaching knowledge empowerment. It was through the identification of PM2.5 that people are able to recognize haze as well as the environmental idea. However, The Jie Gan Fen Shao Events (or Straws Burning Events) has undermined the dialogues between urban discourses and rural discourses. Both discursive practice and sociocultural practice of PM 2.5 present distinctive class attributes. This study provides a rhetorical approach to the history of ideas, including the identification and analysis of six rhetorical perspectives: rhetoric resources, discursive forms, frameworks, articulation, rhetoric practice, and class criticism.