Pollution can directly kill or harm fish, or change the makeup of the fish' surroundings, killing off sources of food or causing plant or algae overgrowth that starve the fish of oxygen.

As per the Clean Air Network, 53% of Hong Kong's pollution comes from local sources – power stations, idling engines of cars, trucks and buses and marine emissions. The Chesapeake Bay watershed encompasses the entire District of Columbia, as well as parts of six states: Delaware, Maryland, New York, Pennsylvania, Virginia, and West Virginia.
The Chesapeake Bay's ecological health has actually dipped slightly in recent years, even though pollution levels improved in 2013, according to federal scientists. Car pollutants cause immediate and long-term effects on the environment. It develops in two contexts: indoor (household) air pollution and outdoor air pollution. The Chesapeake Bay is the largest estuary in the United States and the third largest in the world. Nutrients (nitrogen and phosphorus) and sediment are the top pollutants harming aquatic life, degrading habitat, and making local waterways unsafe.In 2015, the Potomac was the only major river in the Chesapeake Bay watershed experiencing both short- and long-term reductions for these three pollutants. Scientists report that 90% of large fish, such as tuna and swordfish, have been removed from the ocean through fishing .

Click here for more ways you can take action against marine life decline.

Excess nitrogen can fuel the growth of algae blooms, which can block sunlight from reaching underwater grasses and create low-oxygen “dead zones” that suffocate marine life.

Cars, trucks, and buses powered by fossil fuels are major contributors to air pollution. Engine noise and fuel spills also cause pollution. Air pollution is one of the world’s largest health and environmental problems. Causes. Scientists and environmental managers break pollution into two categories: point source and nonpoint source pollution.

Harmful Air Pollution In The US Is Declining, Though The Number Of Cars Isn't Aug 23, 2014 04:06 PM By Lecia Bushak Despite the fact that the U.S. has seen an increase in automobiles, industrialization, and population, the EPA reports that air quality has been improving across the country.
Pollution causes the suppression of behavioral and immune systems in fish, the development of intersex conditions in fish and impaired reproduction of fish eating birds.

This particular subspecies had been the subject of extensive study by researchers at Stanford University …

Besides the species inside of the bay being affected the locals living around the bay are also affected. Nitrogen. There, the team was able to examine how nitrogen has left a residual impact over 150 years in an area with rare plants used by a threatened butterfly, the Edith's Bay checkerspot. The Bay checkerspot is a butterfly endemic to the San Francisco Bay region of the U.S. state of California.

At the same time, they said that the element's pollution is diffuse and a bit hard to track, because it …

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