The relative rates of EGFR-driven lung cancer incidence (per 100,000 population), per 1 μg m−3 increment of PM2.5 levels were 0.63 (P = 0.0028) in England, 0.71 (P = 0.0091) in South Korea and 1.82 (P = 4.01 ×10−6) in Taiwan. The gene discussed is EGFR; the disease is lung cancer.