Tough words

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Across
  1. 2. personal cleanliness
  2. 3. long slender shaft thrown in field events
  3. 6. increase in number
  4. 8. harmful substance in the air, water, or soil
  5. 10. the way that something looks
  6. 11. upper or top floor of a building
  7. 13. something indicating a limit
  8. 14. estimate or make a guess
  9. 15. single or separate
Down
  1. 1. uneasy or worried
  2. 4. a book or set of books giving information on many subjects or on many aspects of one subject and typically arranged alphabetically
  3. 5. a permit from an authority to own or use something, do a particular thing, or carry on a trade
  4. 7. goods to be bought and sold
  5. 9. of, from, in, or characteristic of a country or language other than one's own
  6. 12. change