Question to the Department for Environment, Food and Rural Affairs:

To ask the Secretary of State for Environment, Food and Rural Affairs, pursuant to the Answer of 15 October 2024 to Question 7788 on Air Pollution, what guidance his Department provides on safe limits of NOx.

The Air Quality Standards Regulations (2010) set a limit of 40µg/m³ for the annual average concentration of NO₂ (a component of NOx). This threshold, determined with consideration of pertinent health guidelines, aims to safeguard human health.

NOx is extensively monitored across the UK, and monitoring data is made available to the public in near real-time on Defra’s UK-AIR website. Defra annually publishes Air Quality Accredited Official Statistics, available here: https://www.gov.uk/government/collections/air-quality-and-emissions-statistics.

Through the NO₂ programme, Defra is working closely with local authorities to deliver air quality measures to meet legal limits for NO₂ and improve the health of their residents.

Further to this, in 2022, Defra updated the statutory policy and technical guidance for local authorities on their responsibilities for Local Air Quality Management, including achievement of legal air quality limits for local communities.