. 2023 Jun 7;414:137755. doi: 10.1016/j.jclepro.2023.137755

Table 3.

Explanation of the co-coordinate system.

Point distribution	Implication
First quadrant	Reducing both air pollutants and CO₂ emissions.
Second quadrant	Reducing air pollutant emissions while increasing CO₂ emissions.
Third quadrant	Increasing both air pollutants and CO₂ emissions.
Forth quadrant	Reducing CO₂ emissions while increasing air pollutant emissions.
Origin	No effect on air pollutants or CO₂.
Positive half-axis of horizontal coordinate	Reduces CO₂ emissions while having no effect on air pollutant emissions.
Negative half-axis of horizontal coordinate	Increase CO₂ emissions while having no effect on air pollutant emissions.
Positive half-axis of vertical coordinate	Reduces air pollutant emissions while having no effect on CO₂ emissions.
Negative half-axis of vertical coordinate	Increase air pollutant emissions while having no effect on CO₂ emissions.