1.   Be careful not to inhale dust.

2.   But some experts, like Landrigan, who supervised the city sandbox analysis, believe that it remains a potential play hazard if sand dust is inhaled.

3.   Humans contract the virus by inhaling dust contaminated by mouse droppings or urine.

4.   It can cause brain damage when paint chips are swallowed or when paint dust is inhaled.

5.   Or they may inhale lead dust that is created during home renovations or when old paint is being sanded or scraped.

6.   People become infected with the virus by coming into contact with rodent droppings or inhaling dust that has been contaminated with rodent urine.

7.   Some doctors see only minor, irritating symptoms from inhaling the dust that on some days seems to float down like snowflakes.

8.   Many residents fear they inhaled toxic dust released after depleted uranium ballast burned in the intense fire caused by the crash.

9.   Reports from China last week described a ghostly haze over Beijing, and people covering their mouths to avoid inhaling dust.

10.   Some experts believe uranium rounds are environmentally harmful, especially if people and animals inhale the dust that forms when the shells disintegrate.