The children were walking to school in Broadview, Illinois, or leaving a shopping center in Columbus, Ohio. They were at home in Minneapolis, or sitting in a stroller in Chicago, or at an afternoon protest in Portland, Oregon, alongside dogs on leashes and older people pushing walkers.

They were mostly going about their days when federal immigration agents shot tear gas or fired pepper spray near their homes and schools and into their family cars.

The chemicals blew through the air, sometimes for blocks. They seeped into bedrooms, forcing an asthmatic teen to gasp for air. They stuck to the skin of a young girl, who cried, “It burns!” They caused an infant to stop breathing.

ProPublica identified 79 children across the country who have been harmed by tear gas or pepper spray as immigration officers dramatically stepped up their use during President Donald Trump’s immigration crackdown.

The Department of Homeland Security has repeatedly defended its use of the chemicals, asserting its agents aren’t to blame. The fault, a spokesperson said, lies with “agitators” in the crowds and parents who put their children in harm’s way.

But videos reveal the way agents use these weapons. One captures them releasing tear gas into a crowd with at least seven kids just before someone yells, “There’s children here.” Another shows them hurling tear gas canisters at protesters without apparent provocation; then, with the streets already flooded with white smoke, a Customs and Border Protection agent wearing a body camera shoots pepper balls before muttering, “Fuck yeah,” and shouting, “Woo!”

A third shows what happened after an officer fired pepper spray through the driver’s side window of a family’s car, hitting a 1-year-old girl in the back seat; a bystander filmed her in tears, and her family later said she was struggling to breathe. A DHS spokesperson called the incident “a disgusting pepper spray hoax.” But a local pastor who was at the scene rebuked the claim, testifying at an Illinois state accountability commission that “there’s literally video evidence.”

Such scenes of billowing gas and tear-stained faces have prompted some historians to liken the scope and intensity of the agents’ deployment of chemical munitions to brutal crackdowns by Southern law enforcement during the Civil Rights Movement.

And the legality of their use has been challenged. In cities across the country, judges have excoriated both Immigration and Customs Enforcement and CBP, saying their officers used excessive force. One judge said the agents showed “deliberate indifference” to the risks, including to children. They ordered officers to limit the use of these weapons in areas that were the focus of lawsuits. But they had no power to curb the practice nationwide — and kids in other communities, ProPublica found, continued to get hurt.

The controversy over the chemicals has highlighted a lack of consistency in their use: No national standard governs the use of tear gas and pepper spray by law enforcement, and agency policies differ widely. As a result, agents working for DHS could more freely use tear gas in targeted cities like Minneapolis and Portland, where local police policies are stricter.

A Portland officer said in a court declaration that he and several colleagues were tear-gassed by federal agents while observing and patrolling a protest he deemed to be mostly peaceful. At another event, in which he served as incident commander, he said the agents’ use of tear gas was “excessive and disproportionate to the threat posed” and “affected hundreds of peaceful protesters.”

These weapons are toxic, especially to children, who breathe more rapidly, pulling in more contaminated air than adults relative to their body weight. That principle is why coal miners once brought canaries underground, as one emergency medicine doctor explained in a recent court declaration. Because of the birds’ quick breaths and small size, they would stop singing or die when the chemicals started affecting them, giving the miners time to escape. Children are also vulnerable because they have narrower airways and stand closer to the ground, where tear gas tends to pool.

Help ProPublica Report

Do you know any children or teenagers who were exposed — either directly or secondhand — to tear gas or pepper spray? Help us continue tracking these cases by filling out a short form. If you prefer to speak with a reporter directly, you can reach Lisa on Signal at lisasong.42 and Maya at mayamiller.63.

Our commitment to your privacy: All of us take the responsibility of protecting our sources very seriously. We are gathering these cases for the purpose of our reporting and will reach out if we wish to publish any part of your experience. We’re happy to answer any questions you might have about our work and reporting process.

The Trump administration’s use of tear gas has been so extreme — with some children exposed multiple times — that the only research ProPublica found that might approximate the impact is a 2018 survey of Palestinian refugees in the West Bank subjected to the chemicals by Israeli security forces. Kids reported rashes and chronic tonsillitis, but no one knows the extent of the long-term consequences.

ProPublica’s tally of kids harmed by tear gas or pepper spray is nearly four times the number cited in a recent congressional report that relied on news stories, yet it is likely still a vast undercount. We verified incidents by interviewing more than 40 victims or witnesses and reviewing officer-worn body camera footage, social media posts and lawsuits. We included only cases in which we spoke to parents or others with direct knowledge, found at least two news accounts confirming the incident or identified an episode from sworn testimony.

In many of the cases where........

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