By AP National Geographic photographer Jeff Dyer-Smyth reports from Los Angeles.
California has been reeling from wildfires that have devastated nearly half of the state’s coastline and have left more than 30,000 people without power.
The fire season is now over and most of the region is expected to see a lull in the smoke and ash that has enveloped parts of the nation.
But a new study has found that wildfires are not the only source of pollution that contributes to California’s air quality.
As the wildfires continue to rage, air quality officials are increasingly looking at the impact of wildfires on communities and the climate.
The study finds that air pollution can cause significant changes in human health and the environment.
The researchers looked at air quality in a number of California cities, including Los Angeles and San Francisco, and found that more than 70 percent of the city’s air pollution came from wildfires, with some of that pollution being as much as 20 times the EPA’s standard for PM10, or particulate matter.
It’s not just Los Angeles that is seeing increased pollution.
The study found that air quality worsened in areas of San Diego, where wildfires destroyed more than 2,500 structures and killed more than 10 people.
The researchers also found that the region has seen some of the highest levels of PM2.5, a mixture of particles that have a harmful effect on humans.
California also is seeing a spike in the number of people with asthma.
The number of cases has risen from 4,400 in 2014 to 8,800 in 2016, according to the California Department of Public Health and Environment.
The state is working on ways to address the problem, with Gov.
Gavin Newsom calling it an “emergency” in his State of the State address.
“Our goal is to make sure Californians and everyone who lives in the state have access to the tools we need to manage our air and water,” Newsom said.
“But we must also do everything we can to prevent fires from destroying homes and businesses and putting people and the economy at risk.”
The report comes at a time when some communities in the U.S. are reporting dramatic changes in air quality over the past year, including the closure of some coal-fired power plants.