Gas leaf blowers averaged 96.9 dBA at the operator during real landscaping tasks, against 86.4 dBA for battery blowers, and 79% of measured full shifts met or exceeded the 85 dBA NIOSH limit (Alexander et al., NIOSH field study, J Occup Environ Hyg 2025). Road crews clearing brush logged one-minute leaf blower peaks of 107 dBA (Cavallari et al., American Journal of Industrial Medicine 2020), and two gas machines running together still measured 57.3 dB(A) at 800 feet, above the WHO daytime community guideline of 55 dB(A) (Walker and Banks, J Environ Toxicol Stud 2017). In NIOSH audiogram data, landscaping services workers carry a 16% higher adjusted risk of hearing loss than the reference industry (Sekhon et al., International Journal of Audiology 2020). We aggregated data from NIOSH, the U.S. Bureau of Labor Statistics, OSHA, the California Air Resources Board, the California Legislature, the governments of Washington DC and Portland, a Harvard and Quiet Communities field study, and peer-reviewed exposure surveys of groundskeepers and road maintainers. For the broader trades picture, see our roundup of construction worker hearing loss statistics.
TL;DR
- Gas leaf blower tasks averaged 96.9 dBA vs 86.4 dBA for battery blowers, and 79% of full shifts hit 85 dBA (NIOSH, Alexander et al. 2025).
- Leaf blower use by road maintainers peaked at 107 dBA in one-minute samples (Cavallari et al., American Journal of Industrial Medicine 2020).
- 76.7% of university groundskeeper shifts exceeded 85 dBA on NIOSH criteria; 20.5% broke the 90 dBA OSHA limit (Balanay et al., Environmental Health Insights 2016).
- Landscaping services hearing loss prevalence: 15%, adjusted prevalence ratio 1.16 (Sekhon et al., Int J Audiology 2020).
- Two gas machines measured 57.3 dB(A) at 800 feet, and unweighted sound ran 11.2 to 12.5 dB higher (Walker and Banks 2017).
- About 1.3 million grounds maintenance jobs in 2025, with 162,500 openings a year projected (BLS Occupational Outlook Handbook 2025).
- EPA’s model assumes a commercial leaf blower runs 282 hours a year vs 10 for a homeowner’s (Banks and McConnell, EPA-hosted analysis, 2011 data).
- One hour of a commercial leaf blower emits as much ROG plus NOx as driving 1,100 miles (California AB 1346 findings 2021).
- Washington, DC has banned gas leaf blower use since January 1, 2022, with fines up to $500 (DC Department of Licensing and Consumer Protection).
- Portland bans gas blowers year-round from January 1, 2028, with $250 to $1,000 penalties (City of Portland leaf blower FAQ).
1. Operator-Ear Decibels: Gas vs Battery Tools
The battery switch is real noise control, but it is not a hearing conservation program on its own. In the NIOSH field study, battery leaf blowers cut the task average by 10.6 dBA (Alexander et al., J Occup Environ Hyg 2025). On the decibel scale that is a large drop, yet the battery averages for blowers, string trimmers and hedge trimmers still sat above the 85 dBA recommended limit.
The gas numbers explain why the battery debate started with the operator rather than the neighbour. Professional backpack blowers measured in North Carolina pushed past 100 dBA at the source, and chainsaws used by road crews peaked at 111 dBA. The NIOSH landscaping study is open access and reports task-level geometric means for every tool it observed.
| Metric | Value | Source |
|---|---|---|
| Leaf blower task average, gas vs battery | 96.9 vs 86.4 dBA (p < 0.001; n = 157 vs 39) | NIOSH, Alexander et al., J Occup Environ Hyg 2025 |
| String trimmer task average, gas vs battery | 93.0 vs 87.9 dBA (p < 0.001) | NIOSH, Alexander et al. 2025 |
| Stihl BR 600 backpack blower, maximum source level | 102.5 to 105.9 dBA | Balanay et al., Environmental Health Insights 2016 |
| Push mowers vs riding mowers, maximum source levels | 85.5 to 92.4 dBA vs 88.2 to 95.9 dBA | Balanay et al. 2016 |
| Leaf blower use by road maintainers, mean one-minute Leq | 91.2 dBA (SD 7.5), maximum 107 dBA | Cavallari et al., American Journal of Industrial Medicine 2020 |
| Chainsaw use by road maintainers, mean one-minute Leq | 92.1 dBA (SD 7.6), maximum 111 dBA | Cavallari et al. 2020 |
Context note: source levels are the sound at the machine, not the full-shift dose covered in section 2. Most recent available data for source levels: Balanay et al., 2016. Readers who want to check equipment themselves should see our sound level meter and occupational monitoring statistics.
2. Full-Shift Doses: How Often Landscapers Cross the Limit
Task peaks matter less than what accumulates across a working day, and the studies agree that overexposure is the norm, not the exception. 76.7% of 176 groundskeeper shift samples exceeded 85 dBA under NIOSH criteria (Balanay et al., Environmental Health Insights 2016).
The gap between OSHA and NIOSH results is a measurement rule, not a disagreement. OSHA’s table halves the allowed time for every 5 dB above 90 dBA, so the same shift scores lower under OSHA than under NIOSH, which is why only 20.5% of the same samples broke the OSHA limit. The OSHA noise standard still allows just two hours a day at 100 dBA, a level a gas backpack blower can reach at the source.
| Metric | Value | Source |
|---|---|---|
| Landscaping full-shift TWAs at or above the 85 dBA NIOSH REL | 79% (94 of 119); geometric mean 89.1 dBA | NIOSH, Alexander et al., J Occup Environ Hyg 2025 |
| Groundskeeper shifts above 85 dBA (NIOSH) / above 90 dBA OSHA PEL | 76.7% / 20.5% of 176 samples | Balanay et al., Environmental Health Insights 2016 |
| Riding mower users, mean OSHA TWA | 87.6 dBA; 76.0% of users’ TWAs above 85 dBA | Balanay et al. 2016 |
| Road maintainers clearing brush, mean 8-hour TWA | 86.2 dBA (SD 2.6), mean dose 62.1% | Cavallari et al., American Journal of Industrial Medicine 2020 |
| OSHA permissible exposure at 90 dBA vs 95 dBA | 8 hours vs 4 hours per day | OSHA 29 CFR 1910.95, Table G-16 |
| OSHA permissible exposure at 100 dBA vs 115 dBA | 2 hours vs 15 minutes or less per day | OSHA 29 CFR 1910.95, Table G-16 |
| OSHA hearing conservation program trigger | 85 dBA 8-hour TWA, or a 50% dose | OSHA 29 CFR 1910.95 |
Context note: in the NIOSH landscaping sample, the large companies ran OSHA-mandated hearing conservation programs and none of the small companies did (Alexander et al. 2025). The BLS reports that 20% of grounds maintenance workers are self-employed (see section 5), a group no employer program reaches. Factory floors show the same dose problem in a more regulated setting; compare our occupational noise exposure in manufacturing statistics.
3. Hearing Loss Risk in Landscaping and Outdoor Work
Landscaping does not top NIOSH’s hearing loss tables, and that is the point worth reading carefully. Its raw prevalence sits near the national average, yet after adjustment, landscaping services workers had a 16% higher risk of hearing loss than the reference industry (adjusted prevalence ratio 1.16, 95% CI 1.04 to 1.31; Sekhon, Masterson and Themann, International Journal of Audiology 2020).
The national backdrop makes the case for prevention over treatment. NIOSH counts about 27 million U.S. workers exposed to hazardous noise each year, and a 2026 review notes that up to 1 in 3 workers exposed at the 90 dBA OSHA limit are expected to develop permanent noise-induced hearing loss over a 40-year working life (Balk and Neitzel, Public Health Reports 2026).
| Metric | Value | Source |
|---|---|---|
| Hearing loss prevalence, landscaping services (NAICS 561730), 2006-2015 | 15% | Sekhon, Masterson and Themann, Int J Audiology 2020 |
| Adjusted prevalence ratio, landscaping services vs reference industry | 1.16 (95% CI 1.04 to 1.31) | Sekhon et al. 2020 |
| Hearing loss prevalence, all noise-exposed workers | 16.20% (95% CI 16.15 to 16.25), n = 1,908,218 | Sekhon et al. 2020 |
| U.S. workers exposed to hazardous noise each year | About 27 million | CDC/NIOSH Noise and Hearing Loss page (accessed 2026) |
| Workers at the 90 dBA OSHA limit expected to develop permanent NIHL over 40 years | Up to 1 in 3 | Balk and Neitzel, Public Health Reports 2026 |
| Share of all hearing loss attributable to occupational NIHL | Up to 20% | Balk and Neitzel 2026 |
| People in the U.S. with hearing loss | About 73 million (about 1 in 5); 26 million moderate or worse | Balk and Neitzel 2026 |
Context note: the NIOSH services sector analysis covers workers whose employers submitted audiograms, so small landscaping firms without testing programs are likely underrepresented. Most recent available data: Sekhon et al., 2020 (audiograms from 2006-2015). The CDC/NIOSH noise program page states the 85 dBA REL and the 27 million figure.
4. Noise at Distance: What Neighbours and Schools Hear
Community complaints about leaf blowers are often dismissed as subjective. The distance data say otherwise. With two gas machines running together, the A-weighted level was still 57.3 dB(A) at 800 feet (Walker and Banks, J Environ Toxicol Stud 2017), above the 55 dB(A) daytime outdoor guideline from WHO.
The bigger finding is about what the decibel number hides. Low-frequency sound fades far more slowly with distance than mid and high frequencies, and because dB(A) discounts low frequencies, the standard rating underplays the part of the sound that travels through walls and windows. The field team also measured individual blowers louder at 50 feet than their manufacturer ratings. Airport neighbourhoods face a similar mismatch between average metrics and lived experience; see our aircraft noise exposure statistics.
| Metric | Value | Source |
|---|---|---|
| Two gas machines at 800 feet vs WHO daytime guideline | 57.3 dB(A) vs 55 dB(A) | Walker and Banks, J Environ Toxicol Stud 2017 |
| Unweighted Leq above A-weighted LAeq at distance | 11.2 to 12.5 dB higher | Walker and Banks 2017 |
| Drop from machines to 800 feet, low vs mid vs high frequency | 35 vs 51 vs 45 dB | Walker and Banks 2017 |
| Individual blowers at 50 feet, observed vs manufacturer rating | 77.6 to 79 dB(A) observed vs 73 to 77 rated | Walker and Banks 2017 |
| Town pilot field readings, battery vs gas blowers | 60 to 80 dBA vs 70 to 85 dBA | Town of Atherton, CA staff report 2021 |
| EPA-recommended daily averages to prevent annoyance | 55 dBA outdoor, 45 dBA indoor | Balk and Neitzel, Public Health Reports 2026 |
| People in the U.S. exposed to environmental noise linked to cardiovascular risk | About 104 million (nearly 1 in 3) | Balk and Neitzel 2026 |
Context note: Atherton staff reported the battery unit ran at a lower dBA level and a higher pitch, which lowered its perceived noise, but its 7.5 Ah battery lasted 30 to 40 minutes in typical use against a rated 180 minutes (Town of Atherton staff report, July 21, 2021). Balk and Neitzel name gas-powered leaf blowers as a source whose strong low-frequency components readily penetrate walls and windows.
5. The Workforce and How Many Hours the Engines Run
Exposure is a function of time, and commercial crews run equipment on a completely different scale from homeowners. EPA’s emissions model assumes a commercial leaf blower runs 282 hours a year against 10 hours for a residential one, so a commercial blower logs about 28 times the annual run time of a homeowner’s (282 / 10 = 28.2; Banks and McConnell, National Emissions from Lawn and Garden Equipment, EPA-hosted analysis of 2011 data).
That workforce is large and growing. The BLS Occupational Outlook Handbook counts about 1.3 million grounds maintenance jobs and projects growth faster than the all-occupation average, which means a steady stream of new workers entering a job where the default tools exceed the recommended noise limit.
| Metric | Value | Source |
|---|---|---|
| Grounds maintenance jobs, 2025 | 1,299,200 | BLS Occupational Outlook Handbook 2025 |
| Projected employment growth, 2025-2035 | 5% (all occupations: 3%) | BLS Occupational Outlook Handbook 2025 |
| Projected openings per year | About 162,500 | BLS Occupational Outlook Handbook 2025 |
| Share self-employed / share in services to buildings and dwellings | 20% / 48% | BLS Occupational Outlook Handbook 2025 |
| Median hourly wage, May 2025 | $19.27 | BLS Occupational Outlook Handbook 2025 |
| Default annual run time, commercial vs residential leaf blower | 282 vs 10 hours | Banks and McConnell, EPA-hosted analysis (2011 data) |
| Default annual run time, commercial vs residential lawn mower | 406 vs 25 hours | Banks and McConnell (2011 data) |
| Gasoline lawn and garden equipment in use in the U.S. | About 121 million pieces; leaf blowers/vacuums 9% | Banks and McConnell (2011 data) |
Context note: the run-time defaults come from EPA’s Nonroad model, whose baseline equipment population data the authors describe as 15 to 20 years old and not accounting for growth of the commercial industry (Banks and McConnell, EPA-hosted PDF). Most recent available data for equipment counts: 2011.
6. Bans, Phase-Outs and the Emissions Context
Noise starts the local fight, but emissions wrote the state law. California’s AB 1346 findings state that one hour of a commercial leaf blower can emit as much ROG plus NOx as driving 1,100 miles (California Legislative Information, AB 1346). City ordinances then went further than California, moving from sales rules to outright bans on use, with noise named alongside pollution.
Enforcement is where these laws get tested. Washington, DC dropped the old requirement for noise readings: any person who sees a gas blower in use can file a signed complaint within seven days, and investigations can take up to 30 business days (DC Department of Licensing and Consumer Protection). Portland routes complaints through 311 and its noise complaint page (City of Portland leaf blower FAQ).
| Metric | Value | Source |
|---|---|---|
| California AB 1346 | Chapter 753, approved October 9, 2021; applies to engines produced on or after January 1, 2024, or when feasible | California Legislative Information, AB 1346 |
| CARB zero-emission standard for new small off-road engines | Model year 2024 for most equipment; MY 2028 for generators and large pressure washers | California Air Resources Board 2021 |
| California incentive funding for small landscapers | $30 million | California Air Resources Board 2021 |
| California SORE emissions in 2020, daily average | 16.8 tons of NOx and 125 tons of ROG, above light-duty passenger cars | California AB 1346 findings 2021 |
| Washington, DC gas leaf blower use ban | In effect January 1, 2022; fines up to $500 per offense | DC Department of Licensing and Consumer Protection |
| Portland, OR gas handheld and backpack blowers | Banned January to September in 2026-2027; year-round from January 1, 2028; $250 to $1,000 per violation | City of Portland leaf blower FAQ |
| Montgomery County, MD | Council vote 10-1; sales ban July 1, 2024; use ban July 1, 2025 | FOX 5 DC, October 9, 2023 |
Context note: emissions figures are included only where an agency or paper states them. CARB projects small off-road engine smog-forming emissions to reach nearly twice those of passenger cars by 2031, and says its rule cuts 72 tons per day of smog-forming emissions (CARB release). Nationally, landscape maintenance equipment produced 43% of lawn and garden VOC emissions in 2011, and close to 90% of its fine PM came from 2-stroke engines (Banks and McConnell, 2011 data). CARB’s rule covers new sales only; existing gas equipment can still be operated in California. Montgomery County coverage is from FOX 5 DC.
Summary: Landscaping Equipment Noise by the Numbers
| Metric | Value | Source |
|---|---|---|
| Leaf blower task average, gas vs battery | 96.9 vs 86.4 dBA | NIOSH, Alexander et al. 2025 |
| Stihl BR 600 backpack blower, maximum source level | 102.5 to 105.9 dBA | Balanay et al. 2016 |
| Groundskeeper shifts above 85 dBA (NIOSH) / above 90 dBA (OSHA) | 76.7% / 20.5% | Balanay et al. 2016 |
| Leaf blower use by road maintainers, maximum one-minute level | 107 dBA | Cavallari et al. 2020 |
| OSHA permissible time at 100 dBA | 2 hours per day | OSHA 29 CFR 1910.95 |
| OSHA hearing conservation program trigger | 85 dBA 8-hour TWA | OSHA 29 CFR 1910.95 |
| Landscaping services hearing loss prevalence / adjusted PR | 15% / 1.16 | Sekhon et al. 2020 |
| U.S. workers exposed to hazardous noise each year | About 27 million | CDC/NIOSH |
| Workers at 90 dBA expected to develop permanent NIHL over 40 years | Up to 1 in 3 | Balk and Neitzel 2026 |
| Two gas machines at 800 feet vs WHO guideline | 57.3 vs 55 dB(A) | Walker and Banks 2017 |
| Town pilot readings, battery vs gas | 60 to 80 vs 70 to 85 dBA | Town of Atherton 2021 |
| EPA-recommended outdoor / indoor daily averages | 55 / 45 dBA | Balk and Neitzel 2026 |
| Grounds maintenance jobs, 2025 | 1,299,200 | BLS 2025 |
| Commercial vs residential leaf blower run time | 282 vs 10 hours per year | Banks and McConnell (2011 data) |
| One hour of commercial leaf blower, ROG plus NOx equivalent | 1,100 miles of driving | California AB 1346 findings 2021 |
| CARB zero-emission standard start | Model year 2024 | CARB 2021 |
| California incentive funding for small landscapers | $30 million | CARB 2021 |
| DC gas leaf blower fine | Up to $500 per offense | DC DLCP |
| Portland year-round gas blower ban | January 1, 2028 | City of Portland |
| Montgomery County, MD gas blower use ban | July 1, 2025 | FOX 5 DC 2023 |
Methodology and Sources
- NIOSH, Alexander BM et al., Hazardous exposures and engineering controls in the landscaping services industry, J Occup Environ Hyg 2025 (80 workers, 11 worksites, 6 states).
- Balanay JA, Kearney GD, Mannarino AJ, Assessment of Occupational Noise Exposure among Groundskeepers in North Carolina Public Universities, Environmental Health Insights 2016.
- Cavallari JM et al., Development and application of a noise-hazard scheme for road maintainers, American Journal of Industrial Medicine 2020.
- Sekhon NK, Masterson EA, Themann CL (NIOSH), Prevalence of hearing loss among noise-exposed workers within the services sector, 2006-2015, International Journal of Audiology 2020.
- Balk SJ, Neitzel R, Decreasing Noise Exposure Should Be a Public Health Priority, Public Health Reports 2026.
- CDC/NIOSH, Noise and Hearing Loss: About.
- OSHA, 29 CFR 1910.95 Occupational noise exposure.
- Walker E (Harvard T.H. Chan School of Public Health), Banks JL (Quiet Communities), Characteristics of Lawn and Garden Equipment Sound: A Community Pilot Study, J Environ Toxicol Stud 2017.
- Town of Atherton, CA, Review of Battery-Operated Leaf Blower Pilot Program, staff report, July 21, 2021.
- U.S. Bureau of Labor Statistics, Occupational Outlook Handbook: Grounds Maintenance Workers, 2025 data.
- Banks JL (Quiet Communities), McConnell R (US EPA Region 1), National Emissions from Lawn and Garden Equipment, EPA-hosted paper, 2011 data.
- California Legislative Information, AB 1346 bill text, Chapter 753, Statutes of 2021.
- California Air Resources Board, CARB approves updated regulations requiring most new small off-road engines be zero emission by 2024, 2021.
- DC Department of Licensing and Consumer Protection, Leaf Blower Regulations.
- City of Portland, Leaf blower FAQs and gas leaf blower phase-out page.
- FOX 5 DC, Bill phasing out sale, use of gas-powered leaf blowers in Montgomery County signed into law, October 9, 2023.
- Data watch: CDC/NIOSH gives about 27 million U.S. workers exposed to hazardous noise each year, while Balk and Neitzel (2026) cite about 22 million; we report the CDC figure and flag the conflict. The NIOSH landscaping study (Alexander et al. 2025) does not state its data collection year, and its authors caution that fuel vs battery mower results are hard to compare because the battery data came from a single push mower, so we left that comparison out. Walker and Banks (2017, field work in 2015) report the unweighted vs A-weighted gap as holding at all distances, but at the machines themselves the gap in their own table is 4.0 dB. The 2025 NIOSH review summarizes Cavallari et al. with a higher TWA than the 86.2 dBA in the original paper; we use the original. A 2018 gas vs battery blower comparison in J Environ Toxicol Stud could not be retrieved and was not used, DC enforcement counts are not published on the agency page, and Montgomery County fine amounts were not confirmed in a primary source, so they are omitted.
- Last updated: October 18, 2026. We update this roundup quarterly, and the next refresh is expected when the BLS publishes its May 2026 Occupational Employment and Wage Statistics.