OSHA Permissible Exposure Limits

Q1. Suppose that an industrial process produces the following air-contaminant concentrations for the periods shown:

Period Methanol(ppm) Nitric Oxide(ppm) Sulfur Dioxide
8AM - 10 AM 50 5 0
10AM - 11 AM 150 10 1
11 AM -1 PM 100 5 1
1 PM -4 PM` 200 10 1

Taken collectively, would these concentrations exceed the OSHA permissible exposure limits? Explain

Q2. Suppose that the solvent ethanol could serve to replace the methanol in this process, but at the expense of double the concentrations of the solvent in the atmosphere. Would this help or hinder matters? Explain

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Taken collectively, would these concentrations exceed the OSHA permissible exposure limits? Explain

This link provides the exposure limits for nitric oxide: http://www.osha.gov/dts/chemicalsampling/data/CH_256700.html
The acceptable limit is 25 ppm.

This link provides the exposure limits for methanol:
http://www.osha.gov/dts/chemicalsampling/data/CH_251600.html
The acceptable limit is 200 ppm.

This link provides the exposure limits for methanol:
http://www.osha.gov/dts/chemicalsampling/data/CH_268500.html
The acceptable limit is 5 ...