Where's the Sun?

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Across
  1. 2. Something that covers your face
  2. 5. To tell someone how to do something
  3. 6. A mixture of smoke and fog
  4. 10. Things that are bad for the environment
  5. 11. The part of a computer or TV that shows images
Down
  1. 1. To keep away from something
  2. 3. The gas that surrounds the Earth
  3. 4. The capital city of China
  4. 7. The leader of a city
  5. 8. When the Sun goes up in the morning
  6. 9. The coldest season
  7. 12. Black rocks that are burned as fuel