but the volcano is considered to be only dormant and due to its closeness to the city of Arequipa is considered a high risk volcano. - avoid word repetition where possible
The city of Arequipa with about one million inhabitants and infrastructure such as the airport, hydropower plants and reservoirs are within range of Chachani. - you mean "in range of a (Large? average?) eruption of Chachani. Also this section could do with some more explanation. Is the city directly downhill? are there valleys in between? Evacuation plan?
and the Geophysical Institute of Peru in 2018 began installing a monitoring station on Chachani - was it installed or only part-installed that year? If the former then "began" is redundant.
but the volcano is considered to be only dormant and due to its closeness to the city of Arequipa is considered a high risk volcano. - avoid word repetition where possible
The city of Arequipa with about one million inhabitants and infrastructure such as the airport, hydropower plants and reservoirs are within range of Chachani. - you mean "in range of a (Large? average?) eruption of Chachani. Also this section could do with some more explanation. Is the city directly downhill? are there valleys in between? Evacuation plan?
and the Geophysical Institute of Peru in 2018 began installing a monitoring station on Chachani - was it installed or only part-installed that year? If the former then "began" is redundant.