Air Quality in Lancaster, California — Live

Live readings from PurpleAir sensors across Lancaster — with free alerts the moment the air turns.

Live Lancaster AQI from nearby PurpleAir sensors loads when this page opens in a browser, along with a live sensor map covering Lancaster and Quartz Hill, Antelope Acres, Rosamond, Palmdale.

Lancaster's air story is mostly about dirt and wind. The city sits in a high-desert bowl closed in by the Tehachapi range to the northwest and the Sierra Pelona, Portal Ridge and San Gabriel ranges to the south, and the Antelope Valley Air Quality Management District describes a valley of nearly constant winds above 15 miles an hour with frequent events over 25 — winds that swing direction so fast that dust lifted on the west side of the valley settles on the east side, and the other way around. The district names more than 40,000 acres of defunct farmland and utility-scale solar sites on the west side as one of the valley's principal particulate sources. On the worst days that dust shuts the 14 Freeway; the rest of the year it is simply there, and it is why a reading taken in Lancaster can look nothing like a regional forecast written for Los Angeles.

Canairy watches the sensors around your home, your kids' school, and everywhere else you care about, and tells you in plain English when the air changes enough to matter.

Here the wind matters more than the traffic

In its 2018 community air monitoring proposal to the state, the Antelope Valley AQMD described the valley as a desert bowl formed where the Tehachapi range meets the Sierra Pelona, Portal Ridge and San Gabriel ranges, producing high wind speeds that shift direction quickly and unpredictably. Wind rose data the district compiled for 2010 through 2018 showed near-constant winds over 15 miles an hour and frequent events above 25; at Fox Airport in April 2013, 25 mph easterly winds flipped to 25 mph westerly winds within a few hours. That is why the district treats the Antelope Valley as one community rather than a patchwork of neighbourhoods: particulate released on one side of the valley reliably ends up on the other.

None of this is new. A 1970 US Department of Agriculture soil survey of the valley concluded flatly that soil blowing is a hazard in all parts of the Antelope Valley area, and in 1991 the USDA Soil Conservation Service launched a program to stabilise windblown dust from thousands of acres here after it cut visibility at Edwards Air Force Base, scoured paint and landscaping, and caused traffic accidents on area roads. Lancaster's dust rule, AVAQMD Rule 403, was adopted in 1976 and last amended in April 2010. It bars visible dust crossing a property line, caps dust at 20 percent opacity, defines high wind conditions as gusts over 25 miles an hour, and lets operators use windbreaks designed to knock maximum gusts below that number.

Solar farms, old farmland and the dust in between

On 28 May 2013 a dust storm with gusts over 60 miles an hour dropped visibility on State Route 14 near Lancaster to six feet or less, causing a pile-up involving 20 vehicles and injuring at least six people. Weeks earlier, on 5 April 2013, the AVAQMD had issued notices of violation to First Solar over Antelope Valley Solar Ranch 1, the 230-megawatt project along Avenue D west of Lancaster, after dust complaints from nearby residents; the company responded by gravelling dirt roadways and applying a chemical dust suppressant inside the project footprint. Worth saying plainly: reporting at the time found no solid evidence tying that particular storm to that particular site, and the valley's dust also comes off farm fields, off-road vehicle areas and housing tracts.

The same flat, cheap, wide-open ground is what made Lancaster a solar city. The air district's own filing notes that Lancaster produces more solar power per capita than any city in California, changed its building code to require rooftop solar on new homes, and is home to the BYD electric bus and truck factory. Building all of that means scraping desert soil that has sat undisturbed for a very long time — which is exactly why a local dust-control taskforce, the Antelope Valley Resource Conservation District and grassroots groups like Save Our Rural Town have spent years negotiating site-specific dust controls on solar projects here.

One official monitor, and what it doesn't see

The AVAQMD operates a single ambient sampler for PM10 and PM2.5 across the whole valley, and it is in Lancaster — the Division Street site at 43301 Division Street, which also measures carbon monoxide, nitrogen dioxide and ozone. The district has been candid that this monitor sits inside the urban core and is, to some extent, shielded by surrounding development from the windblown dust that occurs across the wider valley. Even so, it says it is not uncommon for that equipment to record PM2.5 above the federal 24-hour standard of 35 micrograms per cubic metre. The valley does not meet California's PM10 standard, and the district has said it has never been properly assessed against the state PM2.5 standard at all.

The health picture behind that is why the district pushed for more monitoring. Emphysema and chronic obstructive pulmonary disease kill 58.9 people per 100,000 in the Antelope Valley portion of Los Angeles County — more than double the countywide rate. Between 2011 and 2015 the county logged 591 Valley Fever cases in the Antelope Valley service planning area, 29 percent of the 2,032 cases reported countywide, from a fungus that gets into the air when wind or digging disturbs desert soil. Neighbourhood sensors are good at telling you when particle levels are high; they cannot tell you whether fungal spores are in that dust.

Lancaster air quality FAQ

Why is there smoke in Lancaster today?

Most often it has drifted in from a fire in the mountains south or west of the valley. The Bobcat Fire, which started on 6 September 2020 when a tree touched a Southern California Edison line, burned 115,997 acres over 83 days and pushed north into the Antelope Valley foothills, with mandatory evacuations at Pearblossom, Juniper Hills, Valyermo and Llano and livestock sheltered at the Antelope Valley Fairgrounds in Lancaster. A month earlier the Lake Fire burned 31,089 acres near Lake Hughes, just west of the valley. If there is no fire in the news, a still winter evening can also mean wood smoke or open burning — the AVAQMD runs a burn forecast line at 661-723-8070, option 1, under its Rule 444 on open outdoor fires.

What is the air quality in Lancaster right now?

This page shows the current AQI for Lancaster from PurpleAir sensors around the city, updated continuously. That is worth having here, because the valley's one official particulate sampler sits on Division Street inside the urban core, and the air district itself says surrounding development partly shields it from the windblown dust happening out in the wider valley. On a windy afternoon a sensor near your own street is the closer answer.

Does the wind clean the air or make it worse?

Both, at different times of year. The AVAQMD says violations of the federal ozone standard happen several times each summer, driven partly by pollution transported from the more congested urban areas to the south, while violations of the state particulate standard usually come in the fall and winter. Wind stirs and disperses smog, but it is also the thing lifting soil off 40,000-plus acres of disturbed ground on the valley's west side.

Is the dust here actually bad for you?

The local health data says it is worth taking seriously. Childhood asthma across Antelope Valley zip codes runs about 15.4 percent, above the Los Angeles County average of 13.1 percent and the California average of 14.1 percent, according to figures the air district drew from the UCLA Center for Health Policy Research. COPD and emphysema deaths here are more than double the county rate, and the valley carries roughly 29 percent of Los Angeles County's Valley Fever cases. On a heavy dust day the sensible move is the boring one: close the windows, run the air conditioning on recirculate rather than a swamp cooler, and move the run indoors.

What AQI level is unhealthy?

Under the US EPA scale, AQI 0–50 is Good and 51–100 is Moderate. From 101 the air is Unhealthy for Sensitive Groups — kids, older adults, and people with asthma or heart conditions — and above 150 it's Unhealthy for everyone. Canairy translates these numbers into a plain-English verdict, like whether to close the windows or move a workout indoors.

Is Canairy free?

Yes. The Canairy app is free to download and includes live air quality for all your saved places, plain-English verdicts, and free push alerts when the air crosses your threshold. A paid plan adds extras like SMS text alerts.

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