70 aqi = calc_aqi_us(pm10_concentration, 'PM10')
71 print("\nThe conversion result of PM10 particle concentration: ")
72 print("- AQI: {}".format(aqi))
73 elif choice == "3": 74 print("1. PM2.5")
75 print("2. PM10")
76 pollutant = input("Enter pollutant type ('PM2.5' or 'PM10'): ")
There should be no whitespace after the final character in a line.