Is air quality better now than 40 years ago?
Particulate matter and other pollution have dramatically decreased over the past 40 years, in large part because of regulations put in place under the Clean Air Act of 1970 and its later updates, experts say.
What happened in the Clean Air Act?
Clean Air Act (CAA), U.S. federal law, passed in 1970 and later amended, to prevent air pollution and thereby protect the ozone layer and promote public health. The Clean Air Act (CAA) gave the federal Environmental Protection Agency (EPA) the power it needed to take effective action to fight environmental pollution.
How clean was the air before the Industrial Revolution?
Before the Industrial Revolution, our planet’s atmosphere was still untainted by human-made pollutants. At least, that’s what scientists thought until recently, when bubbles trapped in Greenland’s ice revealed that we began emitting greenhouse gases at least 2,000 years ago.
How many people died from the Donora smog?
201948 Donora smog / Number of deaths
Killer smog continues to hover over Donora, Pennsylvania, on October 29, 1948. Over a five-day period, the smog killed about 20 people and made thousands more seriously ill. Donora was a town of 14,000 people on the Monongahela River in a valley surrounded by hills.
How did the air pollution start?
Air pollution is caused by solid and liquid particles and certain gases that are suspended in the air. These particles and gases can come from car and truck exhaust, factories, dust, pollen, mold spores, volcanoes and wildfires.
When was air pollution a major concern?
Air pollution continued to be a significant problem up through the middle of the 20th century. In late October of 1948, 20 people were asphyxiated and more than 7,000 became seriously ill as the result of severe air pollution over Donora, Pennsylvania.
What happened in 1948 Donora Pennsylvania US thermal inversion?
1948: An inversion layer settles over the rust belt town of Donora, Pennsylvania, trapping industrial pollution in the atmosphere. When it clears six days later, 20 people are dead, another 50 are dying and hundreds will live out their days with permanently damaged lungs.