Air Quality(AQI) vs DewPtFm

The Air Quality Index (AQI) is used for reporting daily air quality. It tells you how clean or polluted your air is, and what associated health effects might be a concern for you. The AQI focuses on health effects you may experience within a few hours or days after breathing polluted air.  Think of the AQI as a yardstick that runs from 0 to 500. The higher the AQI value, the greater the level of air pollution and the greater the health concern. For example, an AQI value of 50 or below represents good air quality, while an AQI value over 300 represents hazardous air quality. Five major pollutants EPA establishes an AQI for five major air pollutants regulated by the Clean Air Act. Each of these pollutants has a national air quality standard set by EPA to protect public health: * ground-level ozone * particle pollution (also known as particulate matter, including PM2.5 and PM10) * carbon monoxide * sulfur dioxide * nitrogen dioxide

This app computes the dew point temperature and relative humidity from a wet bulb temperature, dry bulb temperature and barometric pressure. If a barometer is not available a guess of 29.8 inches of mercury will usually give a near enough result. Temperatures are in degrees Fahrenheit and pressures in inches of mercury. Uses a computation method suggested by the National Weather Service of the National Oceanic and Atmospheric Administration, USA.