Ms. Jackson has promised to address mercury as well as fine particulates.
Ambient levels of fine particulates vary by place, season and weather.
Is that a necessary cost of further lowering the levels of pollutants like fine particulates?
The SO2 and NOx emissions can generate fine particulates, which are harmful to human respiratory systems.
The embassy also measures fine particulates, which are more harmful to human lungs.
Intensity of emissions of sulphur dioxide were up 17%, hydrochloric acid up 78%, fine particulates 68% and mercury 4%.
The Environmental Protection Agency tightened its daily limit for the tiny specks, or fine particulates, in September.
Among other sources, fine particulates come from diesel engines, power plants, certain industrial processes and even fireplaces.
Researchers have drawn direct and immediate links between ambient levels of fine particulates and hospital admissions and deaths.
"There is no protection from fine particulates, which stay in the air for weeks and are laced with toxins".
It measures carbon monoxide levels as a surrogate for vehicle pollutants, such as fine particulates known as PM2.5s and a toxic gas, nitrogen dioxide, generated by diesel vehicles.
