What it does prove is that extremely high levels of insulation and air-tightness can be achieved at a cost which is quite acceptable for a quality domestic building.

它证明了即使做到极高水平的隔热和气密性，造价也可以降到高品质家庭住宅可以接受的程度。

youdao

In Edinburgh, 18 out of 38 air quality monitoring sites breached acceptable levels of the pollutant, while Aberdeen Council expressed concern over meeting the target near busy roads, the charity said.

BBC: Valley 'most polluted area'