The American Lung Association is responsible in telling people the dangers of pollution as opposed to the US EPA that finds it voluntary to self - assessment. Really

American Lung Association (click here)

The American Lung Association on Climate (click here)

From the direct impact of the temperature and weather changes to the special burdens these changes place on the most vulnerable communities, climate change seriously threatens our wellness—especially our lung health.

Below are Current EPA air quality standards:

The levels of health concern (click here) listed below are general guidelines to be used as a reference so that people can figure out their own sensitivity to air pollution.

• Good: Air quality is good and poses little or no risk.
• Moderate: Air quality is acceptable; however, there may be some health concern for a small number of unusually sensitive people. While EPA cannot identify these people, studies indicate that there are people who experience health effects when air quality is in the moderate range.
• Unhealthy for Sensitive Groups: When air quality is in this range, people who are in sensitive groups, whether the increased risk is due to medical conditions, exposure conditions, or innate susceptibility, may experience health effects when engaged in outdoor activities. However, exposures to ambient concentrations in this range are not likely to result in effects in the general population. For particle pollution, the sensitive groups include people with heart and lung disease, older adults, children, people with diabetes, and people of lower SESlower socio-econonmic status (SES) A composite measure that is often comprised of a number of indicators, including economic status measured by income, social status measured by education, and work status measured by occupation. Each of these linked factors can influence a population's susceptibility to particle pollution-related health effects (Dutton and Levine, 1989)..
• Unhealthy: When air quality is in this range, everyone who is active outdoors may experience effects. Members of sensitive groups are likely to experience more serious effects.
• Very Unhealthy: When air quality is in this range, it is expected that there will be widespread effects among the general population and more serious effects in members of sensitive groups. 
• Hazardous: Air quality in this range triggers health warnings of emergency conditions by media outlets. The entire population is more likely to be affected by serious health effects.