Question

How many different types of primary pollutants together contribute about 90 per cent of the global air pollution?

Select one:
a. Five
b. Three
c. None
d. Seven​

Answer 1

Answer:

a. five

Explanation:

There are five primary pollutants that together contribute about 90 percent of the global air pollution. These are carbon oxides (CO and CO2), nitrogen oxides, sulfur oxides, volatile organic compounds (mostly hydrocarbons) and suspended particulate matter (SPMs).

Answer 2

Answer:

Explanation:

Four