- published: 14 Dec 2015
- views: 116599
Air quality is defined as a measure of the condition of air relative to the requirements of one or more biotic species or to any human need or purpose. Air quality indices (AQI) are numbers used by government agencies to characterize the quality of the air at a given location. As the AQI increases, an increasingly large percentage of the population is likely to experience increasingly severe adverse health effects. To compute the AQI requires an air pollutant concentration from a monitor or model. The function used to convert from air pollutant concentration to AQI varies by pollutant, and is different in different countries. Air quality index values are divided into ranges, and each range is assigned a descriptor and a color code. Standardized public health advisories are associated with each AQI range. An agency might also encourage members of the public to take public transportation or work from home when AQI levels are high.
Most air contaminants do not have an associated AQI. Many countries monitor ground-level ozone, particulates, sulfur dioxide, carbon monoxide and nitrogen dioxide and calculate air quality indices for these pollutants.
where the river cross
crosses the lake
where the words
jump off my pen
and into your pages
do you think
just like that
you can divide
this you as yours
me as mine to
before we were us
if the rain has to separate
from itself
does it say "pick out your cloud?"
pick out your cloud
if there is
a horizontal line
that runs from the map
off your body
straight through the land
shooting up
right through my heart
will this horizontal line
when asked
know how to find
where you end
where i begin
"pick out your cloud"
how light can play
and form a ring of rain
that can change bows into arrows
(i found a thrill)
who we were isn't lost
before we were us
indigo in his own
blue always knew this
if the rain
has to separate
from itself