References: Rashid, R., Chong, F., Islam, S. et al. Taking a deep breath: a qualitative study exploring acceptability and perceived unintended consequences of charging clean air zones and air quality improvement initiatives amongst low-income, multi-ethnic communities in Bradford, UK. BMC Public Health 21, 1305 (2021). https://doi.org/10.1186/s12889-021-11337-z