The correct answer for above statement is:
A. 7
Explanation:
Particle pollution, also identified as particulate material or PM, is a common name for a mixture of solid and liquid droplets excluded in the air. Particle pollution appears in various sizes and shapes and can be formed up of a fraction of several elements, including acids, inorganic compounds organic chemicals, soot, metals, soil or dust scraps, and biological materials .these are really dangerous.
