Lead emitted from vehicles burning leaded petrol (tetraethyl lead additive): Which health effects are most commonly associated with chronic or sub-acute exposure to airborne lead particles released by automobile exhaust?

Introduction / Context:
For decades, many countries used tetraethyl lead as a petrol additive to increase the octane number. Combustion of leaded petrol emitted fine lead particulates into the atmosphere. Recognising the spectrum of health effects from such exposure is crucial for environmental health, occupational hygiene, and public policy.

Given Data / Assumptions:

• Automobiles using leaded petrol release inorganic lead aerosols.
• Human exposure occurs primarily via inhalation and secondary ingestion (settled dust).
• Question asks for health outcomes linked with atmospheric lead exposure.

Concept / Approach:
Lead is a cumulative toxin that interferes with heme synthesis, neural transmission, and gastrointestinal function. Chronic exposure typically presents with neurological symptoms (irritability, depression, cognitive deficits), gastrointestinal distress (abdominal pain, nausea, diarrhea, anorexia leading to weight loss), and neuromuscular impacts (weakness, wrist/foot drop in severe cases). Therefore an inclusive option capturing neurological, muscular, and GI outcomes is correct.

Step-by-Step Solution:

Verification / Alternative check:
Classic clinical descriptions of lead toxicity include abdominal colic, anorexia, peripheral neuropathy with muscle weakness, mood changes, and anemia, aligning with the composite choice.

Why Other Options Are Wrong:

Common Pitfalls:
Assuming only hematologic effects; lead has multi-system impacts, especially on developing nervous systems of children.

Final Answer:
all (a), (b) and (c)