Hanoi is – in a word – polluted. With hundreds of thousands of motorbikes and no real environmental vision from the government, it’s unavoidable. The most obvious culprits in Hanoi’s awful air pollution problem are the buses. The exhaust from the vast majority of the buses is severe. This not only dirties the air (particularly for the unfortunate who get stuck behind buses in traffic), but it also creates traffic hazards as motorbike drivers make extreme and risky maneuvers to avoid trailing the CO2 spewing buses.