Question

question 5
2 pts
what is the main source for sulfur dioxide in the atmosphere?
stationary fuel combustion sources (such as electric utilities and industrial boilers)
non - road mobile sources (such as recreational and construction equipment, marine vessels, aircraft
and locomotives)
wildfires
highway vehicles
industrial and other processes (such as metal smelters, petroleum refineries, cement kilns and dry
cleaners)
question 6
2 pts
lead exposure can cause _ in children.
blue baby syndrome
lowered iq (neurological and cognitive issues)
pneumonia
copd

Explanation:

• For Question 5: Sulfur dioxide (\(SO_2\)) is mainly emitted from stationary fuel combustion sources. These sources burn large amounts of fossil fuels (like coal) which contain sulfur. When burned, the sulfur reacts with oxygen to form \(SO_2\). Electric utilities and industrial boilers are major stationary fuel combustion sources. Non - road mobile sources, wildfires, highway vehicles, and industrial processes (other than fuel combustion in large stationary units) contribute less to the overall \(SO_2\) emissions in the atmosphere compared to stationary fuel combustion.
• For Question 6: Lead is a neurotoxin. When children are exposed to lead, it can cross the blood - brain barrier (especially in developing brains). It interferes with neurotransmitter synthesis, disrupts cell signaling in the nervous system, and affects brain development. This leads to neurological and cognitive issues, including a lowered IQ. Blue baby syndrome is usually associated with nitrate exposure, pneumonia is an infection of the lungs (not directly caused by lead), and COPD (Chronic Obstructive Pulmonary Disease) is mainly related to long - term exposure to respiratory irritants (like cigarette smoke, not lead).

Answer:

Question 5: stationary fuel combustion sources (such as electric utilities and industrial boilers)
Question 6: lowered IQ (neurological and cognitive issues)