The PAHs density is far higher than the limit of"environmental quality standard of surface water"which proves that PAHs pollution of the Meiliang bay source water is serious comparatively.

其中梅梁湾水源地水体中苯并（a）芘浓度远高于《地表水环境质量标准》规定的要求，说明梅梁湾水源地受苯并（a）芘的污染较为严重。

youdao

Only 2—4 ring PAHs were detected in gas phase, and phenanthrene was the most abundant with an average of 55.1% in total PAHs.

结果显示，气相中主要是2—4环的多环芳烃，其中菲为主要的化合物，平均占到总多环芳烃的55.1%。

youdao

Therefore, PAHs ubiquitously and widely distribute in the environment, so people could intake PAHs through the atmosphere, water and food.

因此多环芳烃在环境中无所不在，分布十分广泛，人体可能通过大气、水、食品等途径摄入多环芳烃。

youdao

The water leftover from the extraction process, known as tailings, contains arsenic, mercury, napthenic acids and polycyclic aromatic hydrocarbons (PAHs).

BBC: Canada's 'dirty oil' challenge

Environmental scientist Kevin Timoney says he has seen data that suggest elevated levels of PAHs downstream of the plants, which he says could only be attributable to oil sands production.

BBC: Canada's 'dirty oil' challenge