This is a quantitative, correlational, empiricalanalytical, cross-sectional research aimed at identifying ecological knowledge, as well as finding the relationship between indicators of individual concern and personal criteria regarding the environment in 8th, 9th, 10th, and 11th grade high school students of an urban educational institution in Quindío. Among the knowledge about the environment, recycling (58.8%), chemicals (56.4%), biodiversity (53.7%), and water (52.7%) prevailed; individual concern was 45.7%, while personal criteria was 60.4%. Individual concern has a moderate correlation with personal criteria (p= 0.566), and high correlation with spaces (p= 0.657). It is concluded that the students have relative knowledge about the environment, in which the personal criterion prevails over the individual concern about the environment, an aspect that determines an individual attitude