Select the most appropriate option to fill in the blank.

Several environmentalists from the city conducted a meet to discuss issues related to the ______ pollution levels created by the growing number of pharmaceutical companies.

rise in

The most appropriate option to fill in the blank is rise in.

• Raise in means to increase something.
• Rise in means to increase or to become greater.
• Rising from means to come up from or to originate from.
• Raising of means the act of increasing something.