| cloud obscure | 1.84 | Clouds often obscure it. | ||
| fog obscure | 0.53 | Fog had completely obscured his view. | ||
| mist obscure | 0.39 | The view was obscured by mist. | ||
| smog obscure | 0.39 | But smog obscures this view for all but a few days a year. | ||
| dust obscure | 0.26 | Fine chalky dust obscured the remaining frescoes. | ||
| smoke obscure | 0.26 | Smoke obscured his view Thursday. | ||
| tree obscure | 0.26 | It was obscured by trees. |