窒息剂，窒息原因导致窒息的物质，如有毒气体，或一事件，如溺水。

A substance, such as a toxic gas, or an event, such as drowning, that induces asphyxia.

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死亡是由烟尘吸入导致窒息引起的。

Death was due to asphyxia through smoke inhalation.

《柯林斯英汉双解大词典》

污染控制措施要么不严格要么不存在，导致了令人窒息的雾霾。

Pollution control measures are either not strict or nonexistent, leading to choking clouds of smog.

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