• Categories

  • Most Popular Questions

  • Recently Viewed Questions

  • Recent Answers

    How To Make a Digita… on What does a frequency of 100 H…
    Daigrepont on Can an earthquake cause air tu…
    Benedict on How did God come into exi…
    joshua on How does the human body g…
    Ian on How did God come into exi…
  • Recent Questions

  • Blog Stats

    • 2,218,580 hits
  • Visitors since 11-3-08

    counter create hit
  • Terms and Conditions

  • Warning

    We are doing maintenance on this site, so some posts may disappear for a short time. Sorry. Normal service will soon be resumed...
  • Pages

  • March 2008
    M T W T F S S
    « Feb   Apr »
     12
    3456789
    10111213141516
    17181920212223
    24252627282930
    31  
  • Archives

  • Meta

How is it the world’s air does not smell foul?

How is it the world’s air does not smell foul? Farms, industry and domestic places create some very strong smells, even toxic. What happens to smells that have ‘disappeared’? How do they disappear?
John Brewer from Cheshire (Age 55+)

Advertisements

One Response

  1. Your nose is a very sensitive sense organ. You can detect small amounts of odorous substances in the atmosphere. However once the substance diffuses into the atmosphere it becomes diluted and reaches a concentration value that cannot be detected by your nose. Also such substances are dispersed in the atmosphere by wind and if water soluble are washed out by rain into the rivers and soil. Substances in the atmosphere may also be degraded by sunlight. What you have to be careful of when smelling a substance such as hydrogen sulphide (the bad egg smell) is that your nose rapidly becomes insensitized, and yet there may still be a fair concentration of the gas in your surrounding environment. Gases such as this have a threshold limit value that should not be exceeded in the atmosphere. Your local Environmental Health Dept routinely monitor the air for such substances. A number of years ago I worked on measuring sulphur dioxide and carbon in the air just after smoke control areas were introduced in the big cities. Once people stopped burning coal there was a rapid improvement in the quality of the air.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: