A mixed-methods study of indoor air quality on children’s respiratory health and quality of life

{
“title”: “Dust, Fire, and Failing Homes: Inside the Air Making Children Sick Near California’s Salton Sea”,
“html”: “On a windy afternoon in the Eastern Coachella Valley, the horizon can vanish behind a wall of dust rolling off the exposed lakebed of California’s Salton Sea. For most residents, the haboobs that sweep across this agricultural desert region are an inconvenience. For the mothers of children with asthma who live along the Sea’s shrinking shoreline, they are a signal to seal the doors, cover their children’s faces, and wait out the storm indoors—only to discover that the storm has followed them inside. A new mixed-methods study published in BMC Environmental Science has now quantified what these families have long described from lived experience: when extreme weather strikes outdoors, the air inside their homes degrades dramatically, with particulate matter levels doubling during fires and spiking six-fold during dust storms.

The research, led by Ashley Trinidad and Ann Marie Cheney of the University of California, Riverside, together with atmospheric physicist William C. Porter and community partners, combined hard sensor data with the deeply personal lens of photovoice, a method in which participants photograph their own environments and narrate their meaning. Fifteen Latina mothers, nearly all born in Mexico and many belonging to the Indigenous Purépecha community, took part. Each household received a low-cost MODULAIR-PM air quality monitor placed in the room where the family spent the most time, recording fine and coarse particulate matter—PM2.5 and PM10—at one-minute resolution. The mothers then documented their surroundings with smartphone cameras during two deliberately chosen weekends in March and July 2022, periods selected because meteorological forecasts pointed to likely dust events, and sat for semi-structured interviews about what their images revealed.

The technical findings are stark. During a March garbage fire that erupted within a mile of several participants’ apartment building, indoor PM2.5 concentrations in the nearest homes more than doubled—and remained elevated for days after the blaze was extinguished within 24 hours. In July, a full-blown dust storm known as a haboob drove average indoor PM10 levels in participating homes to six times their typical range, as fine desert sand infiltrated even sealed doors and windows. Because the sensors recorded continuously, the team could distinguish event periods from baseline conditions in each home, comparing daily averages for the longer fire episode and rapid 15-minute intervals for the fast-moving dust storm, an approach that preserved the sharp temporal signature of coarse particles dominating during windblown dust.

But the numbers only tell half the story. The photographs and narratives the mothers produced reveal how environmental degradation becomes embodied in the rhythms of family life. One mother, Sol, photographed a fire near her home and described rushing her three-year-old son inside to protect his lungs, knowing the smoke could trigger an asthma attack. Another, Sabina, captured a windborne plume of smoke visible from miles away and recounted how her thirteen-year-old son began coughing uncontrollably during outdoor activities until she brought him inside and reached for his inhaler. Nora photographed a highway dissolving into brown haze as a dust storm arrived, remarking how a pleasant sunny morning can turn into choking winds by afternoon.

The mothers’ accounts describe dust so fine that it penetrates homes even when windows are shut, accumulating along door cracks and window sills. Noemi photographed the dust blanketing her front doormat and described how her eight-year-old daughter’s eyes tear up when the wind rises. The caregivers consistently linked the dust to their children’s asthma, allergies, and nosebleeds. Beyond individual symptoms, the exposures ripple outward into education and employment: children miss school during dusty days, schools send symptomatic children home—sometimes mistaking allergic reactions for contagious illnesses such as COVID-19—and caregivers are forced to leave work, compounding the economic precarity of families already facing disadvantage.

In response, the mothers have developed elaborate strategies of vigilance and avoidance. They keep children indoors when the air smells of rotten eggs—a sulfurous odor associated with the Salton Sea’s hypersaline, fish-strewn shores—or when heat and wind combine to worsen symptoms. They wrap children’s heads, throats, and mouths before outings, ration outdoor play, and manage daily regimens of allergy medications and inhalers. The study’s authors frame these behaviors as rational adaptations to conditions largely outside families’ control, recommending that households in affected regions keep doors and windows closed or sealed with weatherstripping during extreme weather events and use air filters to circulate and clean indoor air.

The setting itself is inseparable from the science. The Salton Sea, California’s largest body of water, has been sustained for a century by agricultural runoff from the Colorado River, driving its salinity far above ocean levels. Since 2018, Colorado River water has ceased flowing into the Sea, and rising temperatures have accelerated the exposure of its toxic lakebed. As the shoreline recedes, windblown dust from the dried bed has become a growing public health emergency. Prior research cited in the study found that Salton Sea PM10 is particularly harmful, associated with significantly elevated rates of respiratory hospitalization in surrounding communities, and laboratory work showed that aerosolized dust extracts from the drying lake trigger acute neutrophilic lung inflammation in animal models—a distinct innate immune response rather than a typical allergic reaction.

The study also situates these findings within a broader architecture of environmental inequity. Many of the communities near the Sea, including Thermal, North Shore, Mecca, and Oasis, are unincorporated—lacking mayors, city councils, paved roads, sidewalks, clinics, and structurally sound housing with adequate ventilation and insulation. National data show that people of color in the United States experience systematically higher PM2.5 exposure than White populations, shaped by land-use policies, housing patterns, and weak regulatory enforcement. Children are especially vulnerable because their lungs are still developing and they breathe more air relative to body weight than adults. The authors argue that photographs of hazy horizons and dust-caked doorsteps constitute visual evidence of what scholar Rob Nixon terms “slow violence”—gradual, dispersed harm that accumulates in bodies and places while remaining invisible to policymakers.

By merging caregiver testimony with objective air quality measurements, the study fills a methodological gap in environmental health research, in which the lived experience of affected communities is rarely paired with standardized exposure data. It also elevates a population—Latino and Indigenous Mexican families—that has been historically underrepresented in environmental health studies. The work was grounded in community-based participatory research, with bilingual community health workers, or promotoras, and a twelve-member community advisory board shaping everything from recruitment to dissemination, and the findings were shared back to the community through a photovoice gallery presented at a public meeting attended by a congressional representative.

The road ahead, the researchers say, involves understanding how housing typologies—trailers, converted sheds, multifamily apartments, and aging mobile homes—mediate indoor air quality, and how seasonal temperature differences between indoors and outdoors govern pollutant infiltration. Evidence already suggests mobile and multifamily housing admits more ambient particulate matter than detached single-family homes. For now, the study’s message is blunt: policies that improve housing quality, expand environmental health education, and ensure equitable access to air filtration and clinical care are urgently needed to reduce particulate matter exposure for children whose homes offer no true refuge from the dust storm outside.

“,
“excerpt”: “A mixed-methods study combining indoor air sensors and photovoice narratives shows that dust storms and fires near California’s Salton Sea drastically worsen the air inside homes, harming children’s respiratory health and disrupting family life.”,
“subject”: “Indoor air quality and children’s respiratory health in communities near the Salton Sea”,
“tags”: [“indoor air quality”, “particulate matter”, “children’s respiratory health”, “asthma”, “Salton Sea”, “dust storms”, “PM2.5”, “PM10”, “environmental justice”, “photovoice”, “Latinx health”, “Eastern Coachella Valley”]
}

The biological basis for concern is well established. Particulate matter is classified by diameter, with PM2.5 and PM10 referring to particles smaller than 2.5 and 10 microns respectively. Because of their small size, these particles can bypass the body’s natural defenses, penetrate deep into lung tissue, and in the finest fraction even enter the bloodstream. Chronic exposure has been linked to asthma exacerbations, reduced lung function, heart attacks, and stroke, making repeated indoor infiltration during dust events a compounding rather than transient hazard for children whose lungs are still developing.

The study’s indoor findings also connect to a broader literature on housing and exposure pathways. In multi-unit buildings, air moves between apartments through shared hallways, stairwells, ventilation ducts, and gaps around plumbing and electrical systems, meaning that cooking, smoking, or cleaning in one unit can degrade air in neighboring units. Older buildings often have outdated or poorly maintained ventilation, leading residents to rely on open windows for airflow—a practice that improves circulation but draws in outdoor pollutants in areas with high ambient particulate levels. Overcrowding further reduces air exchange and promotes the accumulation of allergens and moisture.

Exposure risks can also travel home from work. Pollutants encountered in occupational settings, such as agricultural dust and chemicals common in low-wage labor, adhere to clothing, shoes, skin, and hair, carrying hazards into households and exposing children indirectly. The researchers note that these layered environmental, occupational, and residential exposures contribute to pulmonary, renal, immunological, and cardiovascular disease, and that community-engaged methods like photovoice remain rare companions to standardized air monitoring despite their value in revealing how families recognize and respond to hazards.

Subject of Research: A mixed-methods study of indoor air quality on children’s respiratory health and quality of life

Article Title: A mixed-methods study of indoor air quality on children’s respiratory health and quality of life

Article References: Trinidad, A., Porter, W. C., Rodriguez, S., Ortiz, G., Pozar, M., & Cheney, A. M. (2026). A mixed-methods study of indoor air quality on children’s respiratory health and quality of life. BMC Environmental Science, 3(1), Article 18. https://doi.org/10.1186/s44329-026-00060-y

Image Credits: AI Generated

DOI: 10.1186/s44329-026-00060-y

Keywords: mixed-methods, indoor, quality, children, respiratory, health, life, scientific research