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What is true when it comes to the development of the air quality in built-up areas since the early 1990s?

The levels of soot have been reduced by approximately 60 per cent since 1990. [...] Nitric oxide emissions have been reduced by approximately 60 per cent since the base year of 1990. [...] Hydrocarbon emissions have been reduced by approximately 80 per cent since 1990.” (Swedish Transport Administration)

The air quality has been significantly improved in built-up areas since the 1990s.” (The Swedish Environmental Protection Agency)

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