Ed Avol Interviewed: Is it better to cycle or drive a car in polluted air?

SCEHSC professor and pollution exposure expert Ed Avol was recently interviewed on KPCC, Southern California Public Radio. Avol and other researchers in the Environmental Health Centers based at USC are often called upon to answer questions regarding health and exercise. In this interview with Avol, KPCC was able to capture some of the major questions that people ask when they are concerned about cycling near sources of air pollution.

Click through to the article where Avol details ways to reduce the impacts of air pollution when cycling such as:

  • stay off busy streets
  • consider the wind
  • watch the clock
  • avoid the heat
  • don’t overdo it

KPCC article/interview: Is it better to cycle or drive a car in polluted air? by Susan Carpenter

Center Member Avol Featured in USC Trojan Family Magazine

Keck Medicine of USC’s Ed Avol wants to help Angelenos breathe easy

Katharine Gammon, Spring 2016

ED AVOL DIDN’T start out trying to change Los Angeles. After he earned his master’s degree from Caltech in 1974, the engineer used his chemistry and physics background to measure air pollution. Fairly quickly, though, he became interested in the health aspects of the air we breathe. As a Keck School of Medicine of USC professor, Avol has been instrumental in USC’s influential studies on the relationship between air quality and children’s lung health. Despite his knowledge about smog, Avol has also been an avid runner and running coach in LA for decades. Science writer Katharine Gammon recently caught up with him to talk about his personal experiences in environmental health research.

Click here to read the full story on the USC Trojan Family Magazine website.

SCEHSC Center members involved in KPCC Story: More than 150 LA child care centers dangerously close to freeways

Local KPCC reporter, Deepa Fernandez (Early Childhood Development Correspondent) approached SCEHSC staff and researchers last year to inquire about air pollution monitoring and health effects of near roadway air pollution on children. Today her feature story about childcare centers in Los Angeles in close proximity to freeways was published.We are proud to not only have our center members quoted in the story, but community partners as well.

Deepa Fernandez, KPCC

Culver City writer Tracey Moore loved everything about her daughter’s daycare. It was close to her family’s house, included some Spanish immersion, and her young child was smitten with the staff.

So when the owner informed parents she was moving, there was unanimous consensus among families that they would all follow her.

But when Moore saw the new daycare location, she was devastated: “It’s a side street that dead ends right at the freeway,” she recalled, “and the preschool is about a stone’s throw [away].”

Every day, more than 300,000 cars and trucks rumble through that section of the 405, according to CalTrans data for 2014 – making it one of the most highly-trafficked spots in Los Angeles. Moore didn’t know that specific statistic, but she could see the traffic and was concerned about what she called the “invisible ribbon of particles” drifting off the freeway from cars and trucks directly into the yard of the day care. Read more here

Map: Where child care facilities are next to highways

Most effective air quality policies: a study of the past 20 years

How much has air quality changed in the Southern California region over the past 20 years?  Are these changes related to specific policies to clean the air?  Do air control policies or regulations actually work?

Center investigators have been working to understand the long-term effects of air pollution on our health.  But as the air quality in our environment changes, how does that affect our health? To understand the health impacts of ongoing changes in the environment, it’s helpful to know what has changed in the air and why.

Click to enlarge

Recently, Center investigators reviewed the changes in air quality across southern California over the last 20 years. The findings of Ed Avol (USC Preventive Medicine), Frank Gilliland (USC Preventive Medicine) and Fred Lurmann (Sonoma Technology Inc, a long-time collaborator and contributor to much of our Center research) were the basis of a March 2015 publication in the Journal of the Air and Waste Management Association (JAWMA), entitled “Emissions reduction policies and recent trends in Southern California’s ambient air quality.”

As the JAWMA article details, there have been dramatic improvements in regional air quality across southern California over the past 20 years. Several key air pollutants, tracked by U.S. EPA, dramatically declined in outdoor concentrations between 1994 and 2011. Nitrogen dioxide (NO2), which is a by-product of engine combustion, decreased by 28% – 53% in communities from San Luis Obispo County to San Diego County. Inhalable particle matter (PM, microscopic pieces of dirt floating in the air, in specific size ranges, such as 2.5 microns, denoted as PM 2.5) decreased by 13% -54% across a similar range of communities and areas. Changes in ozone (O3) were less pronounced, improving by 12% – 27%, depending on the community.

Why did this happen, and what does it mean?

NO2 and PM2.5 are closely linked with “primary” emissions: that is, direct emissions from car and truck exhaust, power plants, industry, ocean-going ships, trains, and off-road construction equipment. As emissions from those sources have been reduced over the years, the air has become much cleaner. These improvements have come from the use of cleaner trucks at the Ports of Los Angeles and Long Beach and now through California, a mandated smog check program, requirements for cleaner fuels, requirements for cleaner engines on bus and truck fleets, and a push to get the oldest and dirtiest trucks off the road.

Ozone levels have been much more difficult to reduce, since ozone is not directly emitted by trucks or cars or power plants. Instead, it is a “secondary” pollutant, that is, it is formed in the daytime air by chemical reactions powered by sunlight and chemically enhanced by certain other pollutants in the air. Reducing these other pollutants slows down the production of ozone, but getting BIG reductions in this pollutant is much harder than for other pollutants.

What made these changes happen?

In southern California between the 1990s and today, regulators put hundreds of pollution policies and programs into place.  The most effective collective programs included efforts to reduce on-road emissions. This makes sense, given that there are over 13 million cars operating in Los Angeles County! Remarkably, these air quality improvements occurred even though traffic increased 38%, population increased 30% , economic activity increased 66% and activity in and around the ports increased 160%.

Why did these policies work in Southern California?

There are a huge number of vehicles on the road, plus a busy port with thousands of trucks.  This created a high baseline to start from, with emission reductions making a big difference collectively.  In addition, by the 1990s stationary sources were already well controlled. Sources such as power plants are under local jurisdiction, and agencies such as SCAQMD enforced regulations. In addition, Southern California has no coal burning power plants, which create large amounts of emissions.  These are factors that made the on-road vehicle regulations successful.

Selected clean air policies implemented between 1990 and today:

There are several important points to remember here. We still don’t have “clean air” on some days across Southern California, but there has been a lot of progress. These major policy actions by local, regional and state government agencies and the ports went beyond what was required from federal regulations.  The improvement in air quality is a real success story, but we need to keep up the effort so that more days are “clean” and our air quality meets the levels that science and regulators agree are necessary to protect our health. To see what effect this improvement has had on our health, check out the related research (Gauderman, et. al 2015, Berhane, et. al 2016) done by our investigators during this same period of time.


South Coast AQMD Publishes Video Featuring Center Researchers

The South Coast Air Quality Management District (SC-AQMD) has recently produced a fantastic YouTube video, “Do One Thing” The 9:45 minute video takes a look at the air quality in the LA basin, associated health effects, and what one person can do to make a difference. The video helps remind us of simple things we can do in our daily lives to make a difference in our environment and the air we breathe: things such as riding our bikes on short trips close to home, riding mass transit, and even walking to school with our kids one day a week. The video also highlights personal stories of how people’s health and that of loved ones has been affected by the pollution in the Southern California region. Watch and be inspired to make a difference and “Do One Thing” (or maybe more)! (Note: We are not biased even though this video features two of our researchers:  Ed Avol and Rob McConnell).

For related information on the health effects of traffic related pollution, click through to see this infographic.