Across the country, special fares were on offer in operation on public transport, exhibitions will show the effect of pollution on people and buildings, and new non-polluting types of transport will be on display.

BBC: News | Europe | Off the roads

She outlined the reasons for a more cautious approach, which included the ban or moratorium placed on fracking in other countries, concerns cited by NI Water for the effect of pollution on water supply, and the dangers of well blowouts and earth tremors.

BBC: Hydraulic fracturing

Such findings have come to light more than a year after Japan's amended Water Pollution Prevention Act came into effect.

ECONOMIST: Toxic waste in Japan

Although he cannot definitely rule out a direct effect by the pollution on the birds' metabolism of the yellow pigment, or its incorporation into their feathers, the correlation between a shortage of caterpillars and faded plumage is strong evidence of a link between pollution, diet and bird colour.

ECONOMIST: Great tits

Fossil fuel companies do not take into account the external effect of the cost of pollution or carbon emissions.

FORBES: The Case For A Green Bank

She said Beijing Olympic organizers and Chinese environment authorities are providing the IOC with daily updates about pollution and weather, which can both have an effect on air quality.

CNN: Pollution, Internet, doping dominate Olympics lead-up

He said it was difficult to estimate the true effect because cancer may develop only years after exposure to air pollution.

BBC: Traffic

Many students of climate change argue that, although the artificial release of greenhouse gases such as carbon dioxide works to raise the global temperature, particulate pollution should, by promoting cloud cover and thus reflecting solar energy back into space, have a compensating cooling effect.

ECONOMIST: Weather and pollution