Identify the incorrect statement about air pollutants and sources Evaluate the following statements and choose the one that is wrong.

Introduction / Context:
This question blends toxicology, atmospheric chemistry, and combustion science. Correctly spotting the incorrect statement requires recognising typical emission profiles and natural sources of organic vapours.

Given Data / Assumptions:

• Normal combustion systems can operate in regions that are oxidising or locally reducing.
• Biogenic volatile organic compounds (VOCs) are well-documented.
• Nitrogen dioxide (NO2) has distinct optical absorption features.

Concept / Approach:
(a) Benzo[a]pyrene (a polycyclic aromatic hydrocarbon) is indeed found in tobacco smoke, char/soot, and exhaust—true. (b) NO2 absorbs in the visible (brown color) and UV; it resides in the troposphere—true. (c) Certain trees emit isoprene/terpenes (hydrocarbons), supporting this statement—true. (d) Claiming H2S is never produced is false: reducing zones, incomplete combustion, or fuel-bound sulfur chemistry can yield H2S alongside SO2.

Step-by-Step Solution:

Verification / Alternative check:
Combustion literature notes H2S and COS formation under fuel-rich conditions; flue gas desulfurisation systems also measure reduced sulfur species.

Why Other Options Are Wrong:

Common Pitfalls:
Treating combustion as perfectly oxidising everywhere; in real furnaces, mixing and local equivalence ratios vary spatially.

Final Answer:
H2S is not at all produced during combustion of sulphur bearing fuels as all the sulphur is oxidised to SO2.