Scientists from around the world have gathered in Atlanta this month to determine the best ways to measure this fine particulate matter that is polluting the nation's air, particularly in large urban areas.
(Scientists from around the world; have gathered; L:in Atlanta; T:this month; to determine the best ways) (Scientists from around the world; to determine; the best ways to measure this fine particulate matter) (this fine particulate matter; is polluting; the nation's air, particularly in large urban areas)
Scientists from around the world Scientists from around the world this fine particulate matter
have gathered to determine is polluting
L:in Atlanta T:this month to determine the best ways
the best ways to measure this fine particulate matter
the nation's air, particularly in large urban areas