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It depends on how you define "affected" and whom you ask! It's a very small fraction of those "affected" by traffic pollution. However, both figures are impossible to calculate.
In the eruption of Hualalai, There are no records of human death because of when it erupted. But it affected many of the wildlife.
how many people were affected
thousands of people are affected
Over 10000 people where affected by the tsunami.
3000000 people are affected
1 out of 4 people are affected
how many people are affected by MS (multiple sclerosis)
Most people in the world are affected by dust. (Affected = it influences them in some way)
85 people were affected by H1N1
All people on earth are affected by their environment.
Rohypnol is illegal in the United States, so it is hard to tell how many people are affected by it.