Living Near a Small Airport

Living near a small general aviation (GA) airport can expose your household to airborne lead — a risk most people have never heard of. Piston-engine planes still burn leaded fuel ("100LL," or 100 low-lead avgas), and that lead settles around the airport and into nearby homes, soil, and children. Big commercial airports get most of the attention, but this particular risk belongs to the small fields.

If you live near a large commercial airport instead, the concerns are different. Jet engines do not burn leaded fuel, but they produce large volumes of ultrafine particles and NOx, and studies around major hubs such as Los Angeles International have measured elevated ultrafine particle counts well downwind of the runways. Much of the practical advice in our guide to living near a highway or major road — filtration, sealing the home, timing outdoor activity — applies there too.

What's in the air there

GA airports emit a different pollution profile than jet-served commercial airports.

• Tetraethyl lead from 100LL avgas. Each liter contains about 0.56 grams of lead, and most of it leaves the engine in exhaust. Aviation gasoline is the largest remaining source of lead emissions to air in the United States.
• Ultrafine particles and PM2.5 from piston engines, jet APUs, and idling aircraft.
• VOCs and hydrocarbons from fuel evaporation and incomplete combustion.
• NOx from engines and ground equipment.
• Noise, which is not air pollution but correlates with sleep disruption and cardiovascular stress.

About 170,000 piston-engine aircraft operate in the US, served by thousands of GA airports.

Distance and decay

EPA estimates roughly four million Americans live within 500 meters of an airport that services piston-engine aircraft. About 600 K-12 schools fall inside that same radius.

The Reid-Hillview Airport study in Santa Clara County, California, published in PNAS Nexus in 2023, analyzed more than 14,000 blood lead samples from children five and under living near the airport. Findings:

• Children within 0.5 miles of the airport had blood lead levels about 0.2 micrograms per deciliter higher than otherwise similar children farther away.
• Children downwind had an additional 0.4 micrograms per deciliter increase.
• Blood lead levels rose with the volume of piston-engine traffic and avgas sold.
• The downwind effect persisted out to roughly 1.5 miles.

For context, those increases pushed some children's blood lead levels above what was seen during the Flint water crisis.

Who is most affected

No safe level of lead exposure exists for children. Lead exposure in early childhood is linked to:

• Lower IQ and academic performance.
• Attention and behavioral issues.
• Hearing problems.
• Developmental delays.

Pregnant people also pass lead to a developing fetus. Adults are less sensitive but face cardiovascular and kidney effects at higher chronic exposures.

Schools, daycares, parks, and backyards downwind of the runway are the highest-priority sites.

Local factors

• Runway alignment and prevailing wind determine where exhaust settles. Look up the airport's runway headings and your home's position relative to them.
• Traffic volume matters. A handful of weekend flights produces much less than a busy training airport with a flight school doing pattern work all day.
• Run-up areas at the end of the runway, where pilots check engines at full power before takeoff, are pollution hotspots.
• Soil contamination accumulates over decades. Older homes near long-established airports often have measurable lead in yard soil even when air levels are currently lower.

What you can do

• Test soil and dust in your yard and garden if you live within a half-mile of a GA airport, especially if you have young children. State and county extension services can point to certified labs.
• Wash hands and remove shoes at the door. Lead-bearing dust tracks indoors. Wet-mop hard floors weekly.
• Filter indoor air. A HEPA filter captures lead-bearing particles. MERV 13 on the HVAC helps too.
• Get children's blood lead tested. CDC recommends testing for children at higher risk. Pediatricians can order a finger-stick or venous draw. The reference value for action is 3.5 micrograms per deciliter (lowered from 5 in 2021).
• Garden carefully. Use raised beds with clean imported soil if your ground soil tests high. Leafy greens and root vegetables absorb more lead than fruiting crops.
• Push for unleaded avgas. The FAA's EAGLE initiative targets a transition to unleaded avgas by 2030. Several airports (including Reid-Hillview and San Martin in Santa Clara County) have already stopped selling 100LL. Local advocacy moves this faster.

Sources

• Leaded aviation gasoline exposure risk and child blood lead levels (PNAS Nexus, 2023)
• Santa Clara County: Airborne Lead Study Findings
• EPA: Aircraft Lead Emissions Endangerment Finding
• FAA EAGLE Initiative on Unleaded Avgas
• CDC: Blood Lead Reference Value
• Quartz: Maps of lead exposure near small US airports