Lead concentration of blood is considered alarming at

Options

A. 30 mg/ 100 ml
B. 4-6 mg/100 ml
C. 10 mg/100 ml
D. 20 mg/100ml

Answer

### Step-by-Step Solution:

1. **Understanding Lead as a Pollutant**:
- Lead is classified as a heavy metal pollutant. It is primarily released into the environment through vehicular exhaust emissions.

2. **Pathways of Lead Exposure**:
- Lead can enter the human body through two main pathways:
- **Ingestion**: Consuming contaminated water or food.
- **Inhalation**: Breathing in suspended lead particles present in the air.

3. **Health Impacts of Lead**:
- Lead exposure can lead to various health issues. At certain concentrations, it can be toxic and cause significant health problems.

4. **Determining Alarming Concentration**:
- The concentration of lead in blood that is considered alarming is 30 mg per 100 ml. At this level, lead can be toxic and lead to serious health conditions such as:
- Aplastic anemia
- Tumors
- Cancer

5. **Conclusion**:
- Therefore, the alarming concentration of lead in blood is established at 30 mg per 100 ml.