这家工厂并不放出任何有毒的废气。

The factory does not give off any poisonous exhaust gases.

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这家工厂一直在排放有毒的废气。

The factory had been sending out toxic fumes.

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这是因为将在2011年生效的新法规规定火葬场要过虑出废气中像二恶英，水银这样的有毒物质。

This is because new regulations, due to come into force in 2011, will require crematoriums to filter out toxic substances such as dioxins and mercury from waste gases.

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