Not all vegetation is suitable for an urban environment. In some cases, interactions with traffic fumes can even increase pollution. Scientists are looking for the urban ideal.
The air quality in New Delhi was rated as "severe" for the third day in a row. A thick gray haze covers the city, making travel and outdoor activities both dangerous and difficult.
Europe's environmental watchdog has warned that city dwellers in Europe are at risk of life-threatening air pollution. The report recommends EU countries take rapid action such as decreasing the number of cars in cities.
With the onset of winter, many Balkan cities, such as Belgrade, Sarajevo and Zagreb, become enveloped in a thick cloud of smog. But instead of tackling the problem, politicians are playing it down.
Air pollution in New Delhi has spiked after India's biggest fireworks party of the year. Residents woke up to a pall of grey left behind by acrid smoke from fireworks that remained trapped in the city's cool air.
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