] A global map of nitrogen dioxide in the atmosphere has
] revealed the most precise view yet of pollution hotspots
] around the world.
]
] The map, based on 18 months%u2019 worth of satellite
] data, shows very high levels of NO2 above major European
] and North American cities and across much of north-east
] China. South-east Asia and Africa also have raised
] concentrations of the gas due to their burning of
] vegetation.

Check out China, even compared to Gary Indiana.

Article: World's pollution hotspots revealed from space�| New Scientist