I can't sleep - there is too much noise in the neighborhood at night! ("Many" is used for countable nouns, "noise" is uncountable.)
People should keep a fire extinguisher in a safe place. ("Extinguish" is a verb; we need the noun "extinguisher.")

To have a healthy lifestyle, we should exercise a lot. (SO THAT)
→ We should exercise a lot so that we can have a healthy lifestyle. (Or: We should exercise a lot so that we have a healthy lifestyle.)

You shouldn't go outside of the house during disasters. (INSIDE)
→ You should stay inside the house during disasters.

Using less energy helps us save money and conserve the environment.
An escape plan will help you know how to get outside and go to a safe place.

Polluted air can cause illnesses and even death. (Or: Air pollution can cause illnesses and even death.)
Disasters can take a lot of lives and make people homeless.