Question

1. dust, smoke, sea spray (salt) and other chemicals are examples of , which exist in our air.

Explanation:

In the context of air composition, dust, smoke, sea spray (salt), and other chemicals are examples of particulate matter or aerosols. These are tiny solid or liquid particles suspended in the air. The term "aerosols" (or "particulates") fits here as they are substances dispersed in the air in the form of fine particles or droplets.

Answer:

aerosols (or particulates, or atmospheric particles)