#oxygen-densification

#oxygen-densification

Stagnant indoor air is one of the less discussed reasons houseplants struggle. Fungal spots, mould on the compost surface and pest infestations like mealybugs can all be traced back to a room with no airflow.

Congestion pricing has been a once-in-a-lifetime success story, leading to cleaner air, better transit and faster and safer traffic throughout the city. We knew that to do this right, we had to bring real air quality improvements directly to parts of New York City that have been neglected for far too long.

We created Earth in Action to provide a lens into what's happening on our planet, as it happens. Whether it's something typical, like the current air temperature, or an extreme event like a major dust storm, we wanted to provide an opportunity for people to see them.

The UK Health Security Agency reported around 1,504 heat-associated deaths in England during summer 2025, roughly half the predicted 3,039, despite the season being the warmest on record.

When scientists applied a new model of human survivability that takes into account the body's ability to function and stay cool depending on age, they found all six events had seen non-survivable periods for older people who could not find shade.

Microplastics are pervasive, found everywhere on Earth, from the Sahara Desert to patches of Arctic sea ice. Yet despite these plastic particles' ubiquity, scientists have struggled to determine exactly how many of them are in our atmosphere. Now a new estimate published in Nature suggests that land sources release about 600 quadrillion (600,000,000,000,000,000) microplastic particles into the atmosphere every year, about 20 times more than the number of particles contributed by oceans (about 26 quadrillion).

I was that person who only changed their HVAC filter when it looked like it had grown its own ecosystem. Richie Drew, Vice President of Operations at One Hour Heating & Air Conditioning, puts it bluntly: "Dirty filters can reduce airflow, increase dust in your home and strain your heating system." Think about it this way: your HVAC filter is like the bouncer at an exclusive club, except instead of keeping out people without the right shoes, it's blocking dust particles from circulating through your home.

"So whenever people think about hot weather, they always talk about the temperature," he says. "There's two issues with that. First of all, most people don't realise that the temperature is measured in the shade. So if you're in direct solar radiation, the amount of heat stress you're exposed to is much greater as it will stress your body out a lot more."

The remaining question, though, was where all this methane was coming from in the first place. Throughout the pandemic, there was speculation that the surge might be caused by super-emitter events in the oil and gas sector, or perhaps a lack of maintenance on leaky infrastructure during lockdowns. But the new research suggests that the source of these emissions was not what many expected. The microbial surge

Many human activities - from improper disposal of waste to the degradation of car tyres - release small plastic particles, which have infiltrated the atmosphere, oceans and other ecosystems. These include nanoplastics - particles measuring less than 1 micrometre across - and microplastics, which range from 1 micrometre to around 5 millimetres. They've entered our bodies and brains, and scientists are still working to understand their effects on people's health.

Hazardous conditions along the US southern border have prompted health officials to warn Americans to stay indoors with the windows shut. The US Environmental Protection Agency (EPA) has issued its highest level of alert about the air quality over Texas and New Mexico, calling the pollutants currently in the air over a 150-mile swath of land 'hazardous' to human health.

Plastic is everywhere. Inside the human body, in the depths of the ocean and the far reaches of the Arctic. Now a new study warns that, unless the world changes course, plastic could more than double its damage to human health within the next two decades. The culprit is not plastic litter in the environment or microplastics, but the emissions released across plastic's entire life cycle from fossil fuel extraction and manufacturing to transport, recycling and disposal.

Cities around the world share a common goal: to become healthier and greener, supported by civic infrastructure that restores ecosystems and strengthens public life. The question is how to reach this. Global climate targets, local building codes, and municipal standards increasingly guide designers and planners toward better choices. Still, many cities struggle to translate these frameworks into everyday, street-level comfort and long-term ecological protection.

The past 11 years are the warmest since records began, with the past three top of the leader-board. Hottest of the lot was 2024, which coincided with a strong Niño-a pattern of winds and ocean currents that nudges the thermometer upwards-combined with a peak of the 11-year solar cycle when the sun shines brightest. But in 2025 El Niño tailed off, to be replaced by its opposite pattern, La Niña, and the sun-only a minor part of the story in any case-began to dim.

In a high-growth scenario for the space industry, there could be as many as 2,000 launches per year, which her modeling shows could result in about 3 percent ozone loss, equal to the atmospheric impacts of a bad wildfire season in Australia. She said most of the damage comes from chlorine-rich solid rocket fuels and black carbon in the plumes. The black carbon could also warm parts of the stratosphere by about half-a-degree Celsius as it absorbs sunlight.