Better air quality reduces respiratory symptoms among children in southern CaliforniaBMJ 2016; 353 doi: https://doi.org/10.1136/bmj.i2083 (Published 13 April 2016) Cite this as: BMJ 2016;353:i2083
- Jacqui Wise
Improvements in air quality over the past 20 years in southern California, USA, were linked to statistically significant decreases in bronchitic symptoms in children with and without asthma, a longitudinal study published in JAMA has found.1
Southern California has historically reported high levels of ambient air pollution, but air quality has significantly improved since 1992 owing to a range of policies and strategies.
The study included three cohorts that were followed from 1993 to 2001, 1996 to 2004, and 2003 to 2012. The cohorts included a total of 4602 children from eight communities …