Reducing pollution by things like sulphates has been the goal of clear-air legislation around the world for decades, and finding a downside now would not be helpful.

几十年世界上用类似硫酸盐的物质来减少空气污染、净化全球空气早有立法，而当前寻找一条下坡路来走完全没有意义。

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High thin clouds are very transparent to solar radiation, like clear air.

太阳辐射可以轻易地通过高空薄云层，就像通过空气一样。

youdao

The air was crisp and clear and the sky was blue.

空气清新，天空碧蓝。

《牛津词典》

The Dons boss believes clear-the-air talks between himself and the board will have a positive impact, while revealing he was not given sole blame for the club's recent problems.

BBC: Mark McGhee did not consider leaving from Aberdeen

The American owners and Benitez had clear-the-air talks after the Premier League loss to Manchester United on 16 December and Hicks now insists the Reds manager has their full support.

BBC: Liverpool admit Klinsmann talks

Meanwhile, winger Luis Boa Morte has held clear-the-air talks with Sullivan after criticising the co-owner on Sunday's Match of the Day.

BBC: Gianfranco Zola to discuss West Ham future with owners