More than 92% of the US cities in the United States have at at least 1 type of outdoor water purifying device, according the US Environmental Protection Administration’s latest ranking of outdoor air quality data.
That’s up from the 91.3% that they were in the 2014 ranking.
“We have an ongoing fight with our neighbors to protect water quality, but the data is telling us that outdoor air pollution is a bigger problem than many people realize,” said Robert Zirkelbach, director of the Clean Air Task Force and co-author of the study.
“We’re seeing outdoor air pollutants and ozone levels that are unprecedented.”
The study was conducted in the US and New Zealand by researchers at the EPA and the World Health Organization, and is available online.
The data showed that air quality has been rising since 2014 in the Northeast, Midwest and Southwest, with most of the increases seen in the Southwest.
The highest concentrations of ozone were found in the Midwest, followed by the South and Northeast.
Ozone is a chemical that can cause cancer and other health problems.
Zirkels said that the rising levels of ozone have led to the spread of more bacteria and viruses in the air, which has led to more severe cases of asthma and other respiratory problems.
The researchers also found that the percentage of indoor water purifiers in the country increased from 81% in 2013 to 86% in 2016.
“It’s really about how people live their lives,” Zirklebach said.
“If you’re not using outdoor water systems, then you’re taking in more pollutants than your neighbors.
It’s just not being done.”
The Clean Air Act requires states to establish air quality standards and to collect and report data on indoor air quality, Zirlebach told ABC News.
The Clean Air Commission is responsible for enforcing the law, which he said has failed to address the problem of indoor air pollution.
Zirkelbuch said the study also shows that the number of outdoor-air quality tests is on the rise, despite efforts by states to improve outdoor air in cities.
“The numbers show that indoor air is still the biggest driver of air quality,” he said.
Zircherbuch also said that indoor pollution is growing and that the US has one of the highest rates of air pollution in the world, with average annual air pollution levels in the U.S. ranking 13th in the industrialized world.
“There’s a huge public health crisis that we’re in and the solution is to get outdoor air into our homes,” he told ABC.
“The problem is that the public is unaware.”ABC News’ Ryan Foust contributed to this report.