"Brown air" refers to photochemical smog, a type of air pollution that forms when sunlight reacts with pollutants like nitrogen oxides and volatile organic compounds in the atmosphere. The resulting smog appears brownish due to the presence of nitrogen dioxide (NO₂).
The term “brown air” is used for:
Review the verified answer and explanation for this SPSC – Sindh Public Service Commission past-paper question on CampusFin.
Question context
This question is part of 🧬 Biochemistry within the broader 🧬 Medical Science subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.