B2adjectiveenvironmenthealth
US/ˈhæz.ər.dəs/
UK/ˈhæz.ə.dəs/
dangerous, especially to people's health or safety
In context
Hospitals must follow strict rules when getting rid of hazardous waste.
Air quality in Hanoi reached hazardous levels on several winter mornings.
Climbing the volcano without a local guide is hazardous at this time of year.
Words that go with hazardous
adjective + noun
- hazardous wasteThe company was fined for dumping hazardous waste in a canal.
- hazardous materialsFirefighters are trained to deal with hazardous materials.
- hazardous chemicalsOld batteries contain hazardous chemicals such as lead and mercury.
- hazardous conditionsRescue teams worked in hazardous conditions after the storm.
adjective + preposition
- hazardous to healthSmoke from burning rubbish is hazardous to health.
adverb + adjective
- potentially hazardousScientists are tracking a potentially hazardous asteroid.