I can see that the task requires you to correct and rewrite the statements provided. Let's work through each statement:
a. Correction: In 2007, Japan was the second noisiest country in the world.
b. Correction: The tolerable limit of decibels has been set at thirteen million.
c. Correction: The entity responsible for setting the noise limit is the Pan American Health Organization.
d. Correction: In Spain, nine million people suffer from noise pollution problems.
e. Correction: The World Health Organization approved two decrees to improve the noise pollution situation.
f. Correction: In the hospital, the nighttime limit is 45 decibels, except in the dormitory where it is 40.
By correcting and rewriting the statements, you can ensure that they convey accurate information. If you have any more questions or need further clarification, feel free to ask!