History of Houston and Leaf Blowers:
Dec 2002 Houston Chronicle "West U Residents: Leaf Blowers Too Noisy'
Jan 2003 Houston Chronicle: "West U Mulls Leaf Blower Education Plan"
Nov 2004 Houston Chronicle: "Leaf Blowers on Council Agenda"
Dec 2004 Houston Chronicle: "West U council Tweaks Quiet Hours"
Jul 2010 Houston Chronicle: "Residents Making Noise over Leaf Blowers"
June 2019 Channel 2 News: "West U Noise Ordinance Fails"
Resources:
Los sopladores de hojas y los riesgos a la salud -- a Spanish-language fact sheet on public health concerns (Word file download).
Emissions Test: Truck vs Gas-Leaf Blower
Air Pollution and Pre-Term Birth
Air Pollution and Heart Disease
OSHA; How Do We Protect Our Ears?
The Quiet Coalition, focusing on public-health effects of ambient noise
Also:
List of Communities in the USA with Leaf Blower Restrictions