### cloud | aerosol | smoke:

Toxic smoke
* Some toxic smoke is generated by burn electrical wire
* is emitted by all natural organic substances.

### cloud | aerosol | smoke:

Wood smoke
* attacks our body cells up to forty times longer than tobacco smoke.
* can be harmful when it is inhaled by humans
  - cause irritations of the nose, throat and sinuses
  - damage sperm and cause birth defects
  - often trigger allergic symptoms
* contains approximately two hundred compounds, some of which are carcinogenic
  - both particles and gases
  - formaldehyde and hydrocarbons
  - hundreds of chemicals
* contains many gases and chemicals including many carcinogens
  - organic compounds known to cause cancer as well as other toxic compounds
* is caused by the incomplete combustion of wood
  - more carcinogenic than equal volumes of secondhand tobacco smoke
  - pervasive
  - the number one air pollution problem in residential areas during the fall and winter
* problem for children and adults with asthma and allergies.

Stratospheric aerosol
* are of particular interest
  - usually too sparse to have any effect on atmospheric UV transmission
* play an important role in the formation of polar stratospheric clouds.
* reduce the transmission of sunlight into the umbra.

Sulfate aerosol
* Most sulfate aerosols are particles that can be inhaled.
* are both small and chemically stable.
* have a negative forcing since they reflect sunlight back out into space.

Cirrocumulus cloud
* Most cirrocumulus clouds produce light precipitation
* appear as small, rounded white puffs that appear in long rows.
* are found in the same high levels as cirrus.
* indicate good weather.
* look like many small tufts of cotton hanging high in the sky
  - very small round balls or flakes

Cirrus cloud
* Most cirrus clouds affect climates
  - bring weather
* Most cirrus clouds consist of ice particles
  - produce precipitation
* Some cirrus clouds compose of crystal
  - ice crystal
* Some cirrus clouds have crystal
* bring nice weather

Cold cloud
* Some cold clouds contain only supercooled water.
* exist at or below freezing.

### cloud:

Contrail
* are a trail of condensed water vapor produced by jet aircraft flying at high altitudes
  - composed primarily of water, in the form of ice crystals
  - condensation trails left behind jet aircrafts
  - formed by two basic processes
  - generally at the same altitude
  - the result of normal emissions of water vapor from jet engines
* are the white lines that sometimes form behind high flying aircraft
  - trails that planes leave in the sky
  - wispy, cloud-like trails that follow jets as they arc across the summer sky
* can form many shapes as they are dispersed by horizontal and vertical wind shear
  - through the addition of water vapor to the air from the jet engine exhaust
* cause a positive mean radiative forcing at the top of the atmosphere.
* form due to moisture in the aircraft exhaust.
* spread apart and evaporate with time.
* tend to warm the Earth s surface, similar to thin high clouds.

### cloud | contrail:

Normal contrail
* come from the engines and wingtips of high-flying aircraft.
* dissipate less than one minute after formation.

### cloud:

Cosmic dust
* can ferry in organic molecules.
* comes from asteroids and comets.
* is located in space.
* is split into further types of dust , based on the dust 's location
  - dust, based on the dust's location. * dust, based on the dust's location. These types include intergalactic dust, which can be found between galaxies, interstellar dust, found between stars, circumplanetary dust, which can be found around planets and in planetary rings and interplanetary dust, which can be found between planets

Cumuliform cloud
* Cumuliform clouds are flat-based, massive, globular clouds.
* are common over mountainous areas during summertime
  - just one type of cloud