Q. Magnetite particles, suspected to cause neurodegenerative problems, are generated as environmental pollutants from which of the following? 

1. Brakes of motor vehicles 
2. Engines of motor vehicles 
3. Microwave stoves within homes
4. Power plants
5. Telephone lines

Select the correct answer using the code given below

• 1, 2, 3 and 5 Only 
• 1, 2 and 4 Only
• 3, 4 and 5 Only
• 1, 2, 3, 4 and 5

Answer: b) 1, 2 and 4 Only

Notes:

• Magnetite particles are a highly magnetic mineral form of iron and are known to be present in air pollution.
• Exposure to airborne particulate matter (PM) is associated with pulmonary, cardiovascular and neurological problems.
• Magnetite, a mixed Fe²⁺/Fe³⁺ oxide, is ubiquitous and abundant in PM in urban environments and might play a specific role in both neurodegeneration and cardiovascular disease. 
• Magnetite has been found in homing pigeons, migratory salmon and even bats, and is believed to play a role in their directional orientation.   
• Vehicle brake systems are the major source of airborne magnetite at the roadside.
• Petrol and diesel-engine exhaust are also a source of airborne magnetite.
• Other sources of Magnetite pollution include Power plants.