How high does the concentration of sulphur dioxide has to be to corrode steel?

How high does the concentration of sulphur dioxide has to be to corrode steel? Correct Answer 50 microgram per cubic meter

The concentration at which sulphur dioxide starts corroding steel is very low. The concentration can be as low as about 50 micrograms per cubic meter, which is approximately 2 * 10-2 ppm.
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