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That concluded that mining activity reduced poverty slightly, but that there was significant "worsening of environmental well-being" including increased local water and air pollution.

The Mayor of London, Sir Sadiq Khan, opposes a third runway at Heathrow for this reason as well as because of noise and air pollution.

Other research is underway examining other types of air pollution from the Tijuana River, including bacteria and other pathogens from sewage.

Along the dry shorelines, windblown dust contributes to harmful air pollution in low-income, predominantly Latino communities, where people suffer from asthma and other respiratory illnesses at high rates.

In the five decades since then, the state has enacted dozens of rules to reduce air pollution and planet-warming greenhouse gases.