 On 1 January 2020 Canberra had the worst air quality of any major city in the world, with an AQI of 7700 (USAQI 949).Canberra is a planned city and the inner-city area was originally designed by Walter Burley Griffin, a major 20th-century American architect.Within the central area of the city near Lake Burley Griffin, major roads follow a wheel-and-spoke pattern rather than a grid.