On a Clear Day You Can See Forever

What was the primary cause of the deadly fog in London in December 1952?

• A) A natural weather phenomenon

• B) Heavy black smoke from chimneys

• C) Industrial accidents

• D) Vehicle emissions

How many Londoners died due to the smog event within the first four days?

• A) 500

• B) 1,000

• C) 2,000

• D) 3,000

According to Dr. Joel Schwartz, how many people in the U.S. die prematurely each year due to fine particle pollution?

• A) 50,000

• B) 60,000

• C) 70,000

• D) 80,000

What health issues have been correlated with short-term exposure to fine particles in the air?

• A) Diabetes and hypertension

• B) Heart attacks and irregular heart rhythms

• C) Skin diseases and allergies

• D) Vision impairments and hearing loss

What is the primary cause of the deterioration in visual range in the Eastern U.S. as mentioned in the text?

• Natural weather patterns

• Human activities

• Increase in wildlife populations

• Reduction in forest fires

According to the 1999 regulations by the U.S. Environmental Protection Agency, what is the main goal?

• To increase urban development

• To monitor wildlife through cameras

• To reduce particle air pollution overall

• To promote industrial activities

What does the IMPROVE network primarily monitor?

• Urban development impacts

• Protected visual environments

• Changes in wildlife populations

• Economic impacts of pollution

Where are the IMPROVE monitoring stations located as mentioned in the text?

• Only in urban areas

• In Class I locations such as national parks

• Throughout all states

• Near industrial sites

What is the typical visual range in the East today compared to the past, according to the text?

• Increased from 15 to 30 miles

• Decreased from 80 to 15 miles

• Remained constant at 30 miles

• Increased from 15 to 80 miles

What do "PM10" and "PM2.5" mean in the context of particulate matter?

• PM10 refers to particles smaller than 10 micrometers, and PM2.5 refers to particles smaller than 2.5 micrometers.

• PM10 refers to particles larger than 10 micrometers, and PM2.5 refers to particles larger than 2.5 micrometers.

• PM10 refers to particles with a density of 10 g/cm3, and PM2.5 refers to particles with a density of 2.5 g/cm3.

• PM10 refers to particles emitted by industrial processes, and PM2.5 refers to particles emitted by natural processes.