The above answer is very professional, let me tell you how to judge based on the things around you:
A column of zero-level smoke rises directly into the sky,
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First of all. -Light smoke drifts with the wind
Light breeze level 2 blowing on the face
Red flag display moving leaves level 3
Branches level 4 shaking flying paper
Shaking leafy tree Level 5
Level 6: It is difficult to walk with an umbrella
Level 7: It is difficult to walk in the wind
Level 8: branches are broken by the wind at level 8
Level 9: tiles fly off the roof
Level 10, uprooted trees and houses
Levels 111 and 12 are rare on earth