One of the primary components of industrial smog is ____.

Question

BlackTom AI · Accepted Answer

The question asks about a primary component of industrial smog. 
Option 1: argon. Argon is a noble gas that is inert and not typically involved in smog formation or industrial pollution, so this isn’t a likely primary component. 
Option 2: nitrogen gas (N2). While nitrogen gas makes up a large portion of the atmosphere, it is not a reactive pollutant driving smog formation; thus it is not a primary smog component. 
Option 3: lead. Lead is a toxic metal associated with certain environmental pollutants and historical gasoline additives, but it is not a defining primary component of industrial smog. 
Option 4: sulfur dioxide (SO2). Sulfur dioxide is a key pollutant released from burning sulfur-containing fuels (e.g., coal and oil) and readily forms sulfurous and sulfuric acids in the atmosphere, contributing heavily to the formation of sulfurous/sulfuric aerosols that characterize industrial smog (often called "sulfurous smog"). This makes SO2 a primary component. 
Option 5: mercury. Mercury is a hazardous pollutant associated with various industrial processes, but it is not a principal constituent of the classic industrial smog mixture responsible for the characteristic hazy, acidic smog seen in coal-burning regions. 
In summary, the most accurate choice is sulfur dioxide (SO2) due to its central role in the chemistry and formation of industrial smog, whereas the other options do not directly contribute as the primary smog-causing component.

One of the primary components of industrial smog is ____.单项选择题

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