“空气穹顶”用英文怎么说？

北京教育部门规定，当出现重污染天气时，学校要采取相应防控措施，在发布橙色预警时，应停止体育课、集体操、跑步等户外运动。为了保证孩子们的户外活动时间，北京一些国际学校正在建造“空气穹顶”以隔绝雾霾。

请看《中国日报》的报道：

In order to ensure children do not have to cut down their outdoor activities due to air quality, international schools in Beijing are spending tens of millions of yuan building air domes – large enclosed areas with filtered air.

为了保证孩子不因空气质量而减少户外活动时间，北京一些国际学校正花费数千万元建造“空气穹顶”——充满过滤空气的巨大密闭空间。

“空气穹顶”也称“空气净化穹顶”，英文表达是air dome。这是为了保证学生在重度雾霾天气依然能进行“户外”活动。这一空气穹顶建在学校的网球场上，一侧安有一台air purifier（空气净化器）。建造该穹顶的材料有一半都从美国购买的。

有了空气穹顶，即使天气恶劣，学生也可以踢足球或上PE classes（体育课）。2月25日，北京的AQI（空气质量指数，Air Quality Index）超过了300，而空气穹顶内的air quality monitor（室内空气环境监控仪）显示AQI仅为4。

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