Figure 6 | Scientific Reports

Figure 6

From: Counterfactual time series analysis of short-term change in air pollution following the COVID-19 state of emergency in the United States

Figure 6

Ratio of the estimated \(\Delta_{j}\) for NO2 divided by the estimated \(\Delta_{j}\) for PM2.5 (ρ). A negative ratio implies that the change in NO2 following the declaration of the state of emergency was in the opposite direction of the corresponding changes for PM2.5 (i.e., one pollutant increased while the other decreased). For example, in KY, we found a decline in NO2 but an increase in PM2.5 following the state-level emergency declaration.

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