Due to the carcinogenicity of polycyclic aromatic hydrocarbons, their presence in food and the environment has posed a threat to human health. The residues of various PAHs in drinking water, food additives, cosmetics, workshops and factories have reached international limits. PAHs are also present in carbon-roasted and dried foods, similar to the incomplete combustion of organic matter, formed through a pyrolysis process, and are present in vegetable oils. PAHs in food also originate from petrogenic contamination. The EU standard limits the PAHs content in food. Because Bap can reflect the degree of PAHs pollution, it is required that the amount of BaP in edible oil should not exceed 2.0 μg / kg.

Toilet

A toilet is a piece of sanitary hardware that collects human urine and feces, and sometimes toilet paper, usually for disposal. Flush toilets use water, while dry or non-flush toilets do not. They can be designed for a sitting position popular in Europe and North America with a toilet seat, with additional considerations for those with disabilities, or for a squatting posture more popular in Asia (see squat toilet). In urban areas, flush toilets are usually connected to a sewer system that leads to septic tanks in isolated areas. The waste is known as blackwater and the combined effluent including other sources is sewage. Dry toilets are connected to a pit, removable container, composting chamber, or other storage and treatment device, including urine diversion with a urine-diverting toilet.

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