Ultrafine particles may be linked with adverse health effects in some sensitive populations.

However, air cleaners may not reduce adverse health effects completely in sensitive population such as children, the elderly, and people with asthma and allergies.

The primary standards are designed to protect the health of 'sensitive' populations such as asthmatics, children, and the elderly.

Some reasons cited include possible adverse health effects, harm to the environment, and risks involving sensitive populations.

Primary standards set limits to protect public health, including the health of "sensitive" populations such as asthmatics, children, and the elderly.

The Senate did not specify a number but said the administration needed to set a standard immediately that protected sensitive populations like children and the elderly.

Scientists at the agency, say they are considering the most sensitive populations, including fetuses.

If used according to label instructions in the US, citronella is not expected to pose health risks to people, including children and other sensitive populations.

The Commission can accept Amendment No 10 which points out the importance of looking at effects on sensitive populations.

Another statement that showed concerns about sensitive populations was deleted altogether.