Emissions of ozone, a smog-causing pollutant, are linked to asthma, heart disease and premature death.
Emissions of ozone, a smog-causing pollutant, are linked to asthma, heart disease and premature death. Luke Sharrett New York Times file
Emissions of ozone, a smog-causing pollutant, are linked to asthma, heart disease and premature death. Luke Sharrett New York Times file

A plea for cleaner air

May 09, 2015 05:00 PM

UPDATED May 10, 2015 12:00 AM

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