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NO₂ is nitrogen dioxide.

NO₂ may also refer to:

• Nitrite ion, NO₂⁻
• Nitronium ion, NO₂⁺
• –NO₂, nitro group, characteristic of nitro compounds
• "NO₂", a song by American rock band Phish, from their album Phish

See also

• Number Two (disambiguation)
• N02 (N-zero-two)