If you had to measure the amount of sulfur dioxide coming out of a volcano, what instrument would you use? a tiltmeter a correlation spectrometer a level a seismograph

The answer is:

a correlation spectrometer (COSPEC)

The explanation:

because a correlation spectrometer is the instrument which used in canada for the first time during the 1960's ,it was used to measure the amount of the pollution at the power plant.so, this is the instrument which used to measure the sulfur dioxide in the air or the sulfur dioxide amount which in  the volcanic plume.