||<p>Detailed strategic maps showing noise levels for road noise and rail sources, as
well as Noise Important Areas (NIAs) and exposure data across England, are available
at <a href="https://www.gov.uk/government/publications/strategic-noise-mapping-2019"
This data is searchable by location.</p><p> </p><p>NIAs are currently defined as the
areas where the 1% of the population affected by the highest noise levels from roads
and railways are located according to the results of the strategic noise mapping.
The noise maps and action plans published in July 2019 remain in place for five years.
As we prepare for the next round of noise mapping and action planning, we intend to
consider whether the metrics currently used to identify Important Areas could be improved.</p>