The most hazardous metal pollutant of automobile exhaust is

Options

A. Cadmium
B. Lead
C. Mercury
D. Copper

Answer

To solve the question about the most hazardous metal pollutant of automobile exhaust, we can follow these steps:

### Step 1: Understand the Context
Automobiles are vehicles such as cars, buses, and motorcycles that contribute to environmental pollution. They can cause both noise pollution and air pollution.

**Hint:** Consider the types of pollution that automobiles can cause and the substances they emit.

### Step 2: Identify the Types of Pollutants
Automobile exhaust contains various pollutants, including gases like hydrocarbons, carbon monoxide, and metal pollutants. Among the metal pollutants, several options are provided: cadmium, lead, mercury, and copper.

**Hint:** Focus on the specific types of metal pollutants that are commonly associated with automobile emissions.

### Step 3: Analyze the Options
- **Cadmium:** While it is a toxic metal, it is not primarily associated with automobile exhaust.
- **Lead:** This metal has historically been used in gasoline as an anti-knock agent and is known to be harmful to human health.
- **Mercury:** Though toxic, it is not a significant pollutant from automobile exhaust.
- **Copper:** This is less commonly associated with automobile emissions compared to lead.

**Hint:** Think about which of these metals has a direct link to automobile fuel and exhaust.

### Step 4: Conclude the Most Hazardous Metal Pollutant
Based on the analysis, lead is identified as the most hazardous metal pollutant from automobile exhaust. It is released in two forms during the combustion of petroleum and can adversely affect the maturation and development of red blood cells (RBCs).

**Hint:** Recall the health effects associated with lead exposure to solidify your answer.

### Final Answer
The most hazardous metal pollutant of automobile exhaust is **lead**.

---