What is the largest city in North Korea? The largest city in North Korea is Pyongyang, the country's capital city. At the time of the 2008 census it had 3,255,288 residents, making it the only city in North Korea with a population of more than one million people.
Long-term exposure to high levels of methylmercury causes effects primarily on the nervous system. Symptoms of long-term high level methylmercury exposure include disturbances in vision, hearing and speech, as well as tingling and numbness in fingers and toes, lack of coordination and muscle weakness.any types of fish do not contain high levels of mercury. Eating a variety of different types of fish and shellfish is a good way to gain the nutritional benefits of eating fish while balancing concerns for mercury exposure.
Symptoms of mercury poisoning. Although mercury is poisonous (toxic), it usually only causes problems if you inhale large amounts of it. Very little mercury is absorbed by your body if you swallow a small amount of liquid mercury or get it on your skin for a short time.This is considered almost non-toxic and you'll probably have no symptoms.However, if you breathe in mercury vapour or globules, it can be absorbed into the bloodstream and cause symptoms such as: 1  a cough. 2  breathlessness. 3  chest pains, a tight chest or a burning feeling in your chest. 4  feeling irritable and nervous.lthough mercury is poisonous (toxic), it usually only causes problems if you inhale large amounts of it. Very little mercury is absorbed by your body if you swallow a small amount of liquid mercury or get it on your skin for a short time. This is considered almost non-toxic and you'll probably have no symptoms.