Chemical companies are trying to make sense of a chemical pollution that has been found to be linked to the development of asthma in children in Los Angeles, New York and New York state, the companies said in a joint statement on Wednesday.

The companies said they have begun testing samples from five New York cities to determine if the compounds are present in the air.

They also said they will begin testing the air samples from New York’s Long Island City, the city’s outer boroughs, and the city of New York.

Chemical regulation and health experts say that the use of certain chemicals, such as pesticides, in the food supply, such in food packaging, is a big concern, as is the exposure of children to chemicals that can trigger asthma in some people.

A new study published in the journal Environmental Science & Technology found that children in California, Florida and the United States who live near chemical plants that produce a chemical known as 2,4-D (also known as DEHP or dioxin) were three times more likely to have asthma.

In New York, children living near an industrial chemical plant that produces a chemical called DEHP are six times more than children living in communities that do not live near the plant, according to the study.

In Los Angeles and New Jersey, the study found that DEHP exposure is also more common among children living nearby factories that produce another chemical known in the industry as 2-Methylbenzene.

Both DEHP and 2-methylbenzenes were used in food manufacturing for decades.

Both chemicals are banned in the United Kingdom and the European Union.

The chemicals can also be found in water supply systems and have been linked to health problems.

Both compounds were banned by the Environmental Protection Agency in the U.S. in 2010.DEHP was linked to asthma in more than 50,000 people in the Great Lakes area, where it is produced, the New York Times reported.DEHPs are commonly used in cosmetics, but they are also found in other products, such water filters and aerosols.

DEHP was also linked to more than 60,000 asthma attacks in children and adults in California between 1998 and 2008.

A New York State Department of Health spokeswoman said the chemical was tested in the city in March and April.

The statement said that the testing revealed DEHP in the lungs of 1,766 children in New Jersey and New Yorkers living in New Rochelle, New Jersey.

DEHPs were also detected in 2,664 people in Long Island, the county in which New York is located.

New York City has reported more than 6,000 air-pollution incidents since 2010.

It was the third-largest city in the country to report air pollution on Wednesday, the Times reported, citing data from the city health department.

In the last month, the Health Department issued alerts for three more cases, including two in New Brunswick, New Brunswick.

A third air pollution alert was issued for a town in Maine.

In a separate statement, the company said it will make public the results of the testing on its website in coming days.

The EPA says that it is investigating the issue.