They may look pretty innocuous — those leaf blowers, hedge trimmers and gas mowers wielded by a small army of gardening crews across the state.

They’re not.

According to state air quality officials, those machines are some of the biggest polluters in California. In fact, by 2020, leaf blowers and other small gas engines will create more ozone pollution than all of the passenger cars in the state.

Yes, really, there will be more pollution from gas-powered gardening equipment than from cars, confirms Michael Benjamin, division chief at the California Air Resources Board.

“We expect that ozone-contributing pollutants from small off-road engines will exceed those same emissions from cars around the 2020 time frame,” says Benjamin.

There’s a reason for that: Regulations on car exhaust have gotten tighter and tighter over the years, substantially reducing their ozone-damaging emissions. At the same time, while there have been some controls on the smaller gas engines, there haven’t been enough, says Benjamin.

Pollutants from all of those hedge trimmers and gas chainsaws across the state add up.

“There are about 16 million pieces of small off-road equipment in California. That compares to a vehicle population of about 18 million statewide,” he says.

So the state is planning some sweeping changes to fix that. The California Air Resources Board just proposed a new rule change—to lower emissions from small gas engines by 85 percent within a decade, starting in 2020.

Ulysses Solorcano works on Bautista's gardening crew in LA.
Ulysses Solorcano works on Noe Bautista’s gardening crew in L.A. (David Gorn/KQED)

That will affect landscaping and gardening crews across the state. Noe Bautista of Los Angeles has been on the front line of that pollution most of his life. He has worked on a gardening crew for decades—inhaling the formaldehyde, benzene and particulate matter in the equipment fumes, and enduring up to 100 decibels of noise and constant machine vibration all day, six days per week.

“It’s pretty bad,” says Bautista. “You have to be smelling that smoke all the time, and it can cause you a lot of health problems, allergies and getting sick all the time.”

Now he runs Bautista’s Landscaping in western L.A., so he doesn’t run the gear himself anymore, but he sees his workers facing the same hazards every day.

“You can feel it right away,” he says. “You have a headache right away with all that smoke.”

Bautista is determined that his workers won’t endure the same health problems he’s had. Cal/OSHA does have workplace safety guidelines in place and that helps, he says. But on many small gardening crews, most of the young workers either don’t know they should be wearing face masks or earplugs, or they refuse to wear them.

That’s why Bautista agreed to work with a nonprofit based in Santa Monica called American Green Zone Alliance (AGZA), which is trying to get these crews to switch to electric machinery.

Dan Mabe heads the AGZA group. At an expansive backyard in western Los Angeles, he has spread out a wide lawnful of equipment for Bautista’s workers to test. Once they try out the green machinery — which has less vibration, less noise and no fumes — they’re hooked, says Mabe.

And breakthroughs in technology have given the electric equipment additional power with longer battery life, so it makes sense financially to switch, too, he says.

Dan Mabe and Noe Bautista talk about replacing his crew’s gas-powered equipment with electric versions. (David Gorn/KQED)

Mabe has worked these gardening crews himself — “since I was 7 years old” — and has the health scares and breathing problems to prove it. Mabe’s crusade to trade in gas for electric machinery is based on a desire to improve air quality and workers’ health. But there’s another motivation for him. Many gardening crews across California are Latino, he says, and that takes the discussion to another level.

“You can call it environmental justice. It’s a demographic that isn’t really being addressed.”

Of course, cost will be the sticking point. Many small crews could have trouble affording an upgrade to cleaner equipment.

That’s why the air quality board is putting $200,000 as seed money toward an incentive program to help landscape crews upgrade their gas equipment or convert to electric gear.

But according to Sandra Giarde, executive director of the California Landscape Contractors Association, those incentive programs usually fall woefully short of actual replacement cost.

And, she adds, the association is worried that manufacturers could pass on costs from new air quality requirements, in the form of higher prices.

Bautista, for one, is ponying up the cash now and making the switch.

Not only for health reasons, and not only to get ahead of impending new regulations. He says the economics are actually in his favor. With huge recent improvements in battery life and power, he hopes in the long run he’s going to save a little money.

More Pollution Than Cars? Gas-Powered Gardening Equipment Poses the Next Air Quality Threat 14 February,2017David Gorn
  • Lola Themola

    Electric is a good idea…but the very fine dust that’s blown up in the air and hangs there for a long time, which i understand is mostly fecal matter, is very bad for our health, as well. I have directed my crew to sweep and rake, and it actually takes no more time. A bit more energy, yes.

    • Lola, I would add that AGZA absolutely agrees that brooms and rakes are the best case scenario — for noise, airborne particulates, worker health, and environmental impact. And on an individual case-by-case, with many smaller residential lawns, we encourage homeowners to negotiate with their gardeners for the kind of service you want on your own property. That said, most professional crews who service several dozen or more homes a week — or commercial scale properties — simply cannot maintain the properties at their work rates without blowers. Terraces, hedges, ornate planting beds, and loose surfaces like gravel and wood chips simply can’t be raked or swept — at least not at a pace that allows them to complete their job requirements. But AGZA knows from long experience that the latest lithium-ion battery tools are not only 40% – 70% quieter, they produce zero emissions of CO2, CO, HCs, VOCs, NOx, and PM, and workers can be trained on these advanced tools to kick up far less organic PM as well. Cheers.

  • Lola Themola

    There are garden vacuums that would work well, too, without blowing dust into the air. I’ve seen them used in SF. I think the State should fund a program for these companies to trade in their blowers for vacuums.

    • Lola, please see my response (from AGZA, the American Green Zone Alliance) in the main thread above : )

  • Hillary Clintub

    Shut ’em down or make ’em use nail clippers.

  • Lola, you are correct that organic particulate matter (PM) is a significant problem that is not entirely solved by switching to gas leaf blowers. But our extensive research shows that even in this area, electric is far better than gas. The most dangerous of the cloud of PMs is the PM2.5 of liquid hydrocarbons in gas emissions. These are highly toxic and carcinogenic, and at just 2.5 microns, small enough to be inhaled so deeply into the tissue of the lungs that they not only can’t be coughed out, they are actually absorbed directly into the blood stream. Much of the organic PM (dust, pollen, and yes, microscopic fecal matter) is the much larger PM10, which doesn’t get as deep into the lungs, and are not toxic or carcinogenic. But there’s more advantages to electric than just eliminating the hydrocarbons. The powerful electric motors are lighter and have advanced electronic throttles that are more responsive than those on bulky gas engines. This means that a well-trained operator can blow leaves and debris while using only the minimum MPH / CFM (miles per hour and cubic feet per minute), throwing far less PM of all kinds into the air. Our company — the American Green Zone Alliance (AGZA) — is committed to creating healthier and safer working conditions for the lawn and garden industry by educating, training and accrediting workers to be AGZA Accredited Service Providers. You can learn more on our website Thanks : )

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