This is the best summary I could come up with:

New measures to counter emissions of nitrogen oxides and other air pollutants will also be needed for buildings, heating plants and many other domestic and industrial sources in future.

The warning follows the controversy that has surrounded London’s ultra low emission zone (Ulez) in which drivers are charged for their vehicles’ polluting impact.

The decision has provoked opposition from some drivers and was blamed by various Labour party figures for the Conservatives surprise byelection win in Uxbridge and South Ruislip last month.

But scientists at the Wolfson Atmospheric Chemistry Laboratories at the University of York last week stressed the need to maintain air quality, particularly in cities.

However, the York team said they expected air quality to improve fairly rapidly in London’s outer areas as the extension of the city’s Ulez takes effect.

The problem is made worse because many people think that pollution from boilers and other building heating systems will disappear should gas and oil be replaced by hydrogen as a key fuel for keeping our homes, offices and factories warm.

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I can't see a buildings ULEZ being workable without a massive new scheme of grants and subsidies for household heating upgrades. The main barrier to moving from fossil fuel boilers is cost, for many homes the conversion cost is well into 5 figure territory and unaffordable to many homeowners and unattractive to many landlords.