Air pollution is the worst of any pollution. (positive)

No other pollution is as bad as air pollution.

To transform a superlative degree sentence into its positive degree, especially when it uses "the + superlative degree + of any/all", follow this structure:

    
• Start with "No other" + the singular form of the noun following the superlative adjective.
    
• Use the singular form of the verb.
    
• Follow with "as" or "so" + the positive degree of the adjective + "as" + the subject of the original sentence.

In the given sentence, "Air pollution is the worst of any pollution," "worst" is the superlative form of "bad."

Applying the rule:

    
• "No other" + "pollution" (singular noun)
    
• "is" (singular verb)
    
• "as bad as" (positive degree of 'worst')
    
• "air pollution" (subject)

Thus, the positive degree becomes: "No other pollution is as bad as air pollution."