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GasesToxic fumesParticulates are solid or liquid particles that settle after being dispersed in a gas.

User Jakson
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I think the correct answer is the third option. Particulates are solid or liquid particles that settle after being dispersed in a gas. They are also termed as particle pollution or PM. It is a mixture of very small particles and liquid droplets which includes acids of nitrates and sulfates, organic substance, metals and dust particles.
User Jackilyn
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