Sentence examples for lead have decreased from inspiring English sources

Over the last two decades, atmospheric concentrations of lead have decreased significantly around the globe as more and more nations have chosen to remove tetraethylead from gasoline (Thomas et al. 1999).

In December 2008, a ComRes poll showed the Conservative lead had decreased dramatically, though by February 2009 it had recovered to reach 12 points.

Although exposure to lead has decreased in many countries, significant concerns remain about continued exposure of children to lead.

First, the samples were collected about 10 years ago, and environmental lead has decreased further since that time.

Although the total Swedish emission of lead has decreased, children may still be exposed to lead in air from other regions or countries in the vicinity [ 20].

Zahran et al. (2010) compared aggregate blood lead levels derived from the Louisiana Childhood Blood Lead Surveillance System (CBLSS) pre-Hurricane Katrina to levels post-Hurricane Katrina and found that median blood lead had decreased.

Exposure to lead has decreased substantially in the United States over the past few decades, primarily owing to public health measures including the government-mandated ban of residential lead-based paint in 1978 and phaseout of leaded gasoline in the 1970s and 1980s (ATSDR 2007).

Blood lead levels have decreased in Mexico since leaded fuel was banned in 1997, but other sources remain, including the use of lead-glazed ceramics for food storage and preparation.

Although lead levels have decreased in the general population over the past few decades, lead remains a widespread environmental toxicant [Centers for Disease Control and Prevention CDCC) 2009].

Even though lead levels have decreased in many countries in the last decades, it is now known that even low lead levels, which do not cause symptoms of acute poisoning, are associated with cognitive and neurological disorders [ 4].

Blood lead levels have decreased markedly since the late 1970s.