Epidemiology and Survival Outcomes of Lung Cancer: A Population-Based Study

Figure 2

Annual average of Pollutant Standards Index (PSI, μg/m³) in Taiwan by county in 2002 and 2014. Data were obtained from the Taiwan Air Quality Monitoring Network. PSI is calculated by averaging air pollutant concentration collected for the past 24 hours including particulate matter (PM10), sulfur dioxide (SO₂), nitrogen dioxide (NO₂), carbon monoxide (CO) and ozone (O₃). PSI >100 is considered to impair health.

(a)

(b)