0_Wizard
Just found out I'm allergic to dust mites!  The main species are cosmopolitan pyroglphids but I call them House dust mites. 
The main species are identified as:  The dust mites are cosmopolitan pyroglyphids.
chosen_House_dust_mite_0
House dust mite
chosen_topic_0_House_dust_mite
House dust mite
House dust mites (HDM, or simply dust mites) are a large number of mites found in association with dust in dwellings. The main species are identified as:  The dust mites are cosmopolitan pyroglyphids. House dust mites, due to their very small size and translucent bodies, are barely visible to the unaided eye. A typical house dust mite measures in length. For accurate identification, one needs at least 10× magnification. The body of the house dust mite has a striated cuticle. They feed on skin flakes from humans, and animals, and on some mold. "Dermatophagoides farinae" fungal food choices in 16 tested species commonly found in homes was observed "in vitro" to be "Alternaria alternata", "Cladosporium sphaerospermum", and "Wallemia sebi", and they disliked "Penicillium chrysogenum", "Aspergillus versicolor", and "Stachybotrys chartarum".
Dust
Dust are fine particles of matter. It generally consists of particles in the atmosphere that come from various sources such as soil, dust lifted by weather (an aeolian process), volcanic eruptions, and pollution. Dust in homes, offices, and other human environments contains small amounts of plant pollen, human and animal hairs, textile fibers, paper fibers, minerals from outdoor soil, human skin cells, burnt meteorite particles, and many other materials which may be found in the local environment. House dust mites are present indoors wherever humans live. Positive tests for dust mite allergies are extremely common among people with asthma.
Aspergillus penicillioides
Aspergillus penicillioides is a fungus of the genus "Aspergillus", and is among the most xerophilic fungi. "Aspergillus penicillioides" is typically found in indoor air, house dust, and on substrates with low water activity, such as dried food, foxy papers and binocular lenses. The distribution of the fungus is worldwide as it has been found in bed dusts from maritime temperate, Mediterranean, and tropical climates. The abundance of the fungus is influenced by outdoor climate, with highest numbers found in tropics and lowest numbers in Mediterranean climate. Cool temperature tends to decrease number of "A. penicillioides" in house dusts.
Mite
Mites are small arthropods belonging to the class Arachnida and the subclass Acari (also known as Acarina). The term "mite" refers to the members of several groups in Acari but it is not a clade, and excludes the ticks, order Ixodida. Mites and ticks are characterised by the body being divided into two regions, the cephalothorax or prosoma (there is no separate head), and an opisthosoma. The scientific discipline devoted to the study of ticks and mites is called acarology. Most mites are tiny, less than in length, and have a simple, unsegmented body plan. Their small size makes them easily overlooked; some species live in water, many live in soil as decomposers, others live on plants, sometimes creating galls, while others again are predators or parasites.
Scabies
Scabies, also known as the seven-year itch, is a contagious skin infestation by the mite "Sarcoptes scabiei". The most common symptoms are severe itchiness and a pimple-like rash. Occasionally, tiny burrows may be seen in the skin. In a first ever infection a person will usually develop symptoms in between two and six weeks. During a second infection symptoms may begin in as little as 24 hours. These symptoms can be present across most of the body or just certain areas such as the wrists, between fingers, or along the waistline. The head may be affected, but this is typically only in young children.
Peptidase 1 (mite)
Peptidase 1 (mite) (), also known as endopeptidase 1 (mite), is an enzyme found in various species of mites. This enzyme exhibits cysteine protease activity with broad endopeptidase specificity. The various forms of peptidase 1 pertaining to individual mite species comprise the group 1 mite allergens. Following the naming conventions of allergens, these peptidase 1 variants include Der p 1 of the European house dust mite "Dermatophagoides pteronyssinus"; Der f 1 of the American house dust mite "Dermatophagoides farinae"; Eur m 1 of the Mayne's house dust mite "Euroglyphus maynei"; and Pso o 1 of the sheep scab mite "Psoroptes ovis".
Dander
Dander is an informal term for a material shed from the body of various animals, including humans, which have fur, hair, or feathers. The term is similar to dandruff, when an excess of flakes becomes visible. Skin flakes that come off the main body of an animal are dander, while the flakes of skin called dandruff come from the scalp and are composed of epithelial skin cells. The surface layer of mammalian skin is called the stratum corneum, which is shed as part of normal skin replacement. Dander is microscopic, and can be transported through the air in house dust, where it forms the diet of the house dust mite.
1_Apprentice
I've always heard of them but don't know much about them.
0_Wizard
they are so gross - they feed on skin flakes from people and pets, and sometimes mold. 
They feed on skin flakes from humans, and animals, and on some mold.
chosen_House_dust_mite_0
House dust mite
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Mold health issues
Mold health issues are potentially harmful effects of molds. Molds (US usage; British English "moulds") are ubiquitous in the biosphere, and mold spores are a common component of household and workplace dust. The United States Centers for Disease Control and Prevention reported in its June 2006 report, 'Mold Prevention Strategies and Possible Health Effects in the Aftermath of Hurricanes and Major Floods,' that "excessive exposure to mold-contaminated materials can cause adverse health effects in susceptible persons regardless of the type of mold or the extent of contamination." When mold spores are present in abnormally high quantities, they can present especially hazardous health risks to humans after prolonged exposure, including allergic reactions or poisoning by mycotoxins, or causing fungal infection (mycosis).
Air pollution
Air pollution occurs when harmful substances including particulates and biological molecules are introduced into Earth's atmosphere. It may cause diseases, allergies or death of humans; it may also cause harm to other living organisms such as animals and food crops, and may damage the natural or built environment. Human activity and natural processes can both generate air pollution. Indoor air pollution and poor urban air quality are listed as two of the world's worst toxic pollution problems in the 2008 Blacksmith Institute World's Worst Polluted Places report. According to the 2014 World Health Organization report, air pollution in 2012 caused the deaths of around 7 million people worldwide, an estimate roughly echoed by one from the International Energy Agency.
Casting (metalworking)
In metalworking and jewellery making, casting is a process in which a liquid metal is somehow delivered into a mold that contains a hollow cavity (i.e., a 3-dimensional negative image) of the intended shape. The metal and mold are then cooled, and the metal part (the "casting") is extracted. Casting is most often used for making complex shapes that would be difficult or uneconomical to make by other methods. Casting processes have been known for thousands of years, and have been widely used for sculpture (especially in bronze), jewellery in precious metals, and weapons and tools. Traditional techniques include lost-wax casting (which may be further divided into centrifugal casting and vacuum assist direct pour casting), plaster mold casting and sand casting.
Cockroach
Cockroaches are insects of the order Blattodea, which also includes termites. About 30 cockroach species out of 4,600 are associated with human habitats. About four species are well known as pests. The cockroaches are an ancient group, dating back at least as far as the Carboniferous period, some 320 million years ago. Those early ancestors however lacked the internal ovipositors of modern roaches. Cockroaches are somewhat generalized insects without special adaptations like the sucking mouthparts of aphids and other true bugs; they have chewing mouthparts and are likely among the most primitive of living neopteran insects.
Ixodes holocyclus
Ixodes holocyclus, commonly known as the Australian paralysis tick, is one of about 75 species of Australian tick fauna and is considered the most medically important. It can cause paralysis by injecting neurotoxins into its host. It is usually found in a 20-kilometre wide band following the eastern coastline of Australia. Within this range "Ixodes holocyclus" is the tick most frequently encountered by humans and their pets. As this area also contains the majority of Australia's most densely populated regions, incidents of bites on people, pets and livestock are relatively common. Paralysis ticks are found in many types of habitat particularly areas of high rainfall such as wet sclerophyll forest and temperate rainforest.
Fish disease and parasites
Like humans and other animals, fish suffer from diseases and parasites. Fish defences against disease are specific and non-specific. Non-specific defences include skin and scales, as well as the mucus layer secreted by the epidermis that traps microorganisms and inhibits their growth. If pathogens breach these defences, fish can develop inflammatory responses that increase the flow of blood to infected areas and deliver white blood cells that attempt to destroy the pathogens. Specific defences are specialised responses to particular pathogens recognised by the fish's body, that is adaptative immune responses.
Emergency management
Emergency management is the organization and management of resources and responsibilities for dealing with all humanitarian aspects of emergencies (preparedness, response, and recovery). The aim is to reduce the harmful effects of all hazards, including disasters. It should not be equated to "disaster management". The World Health Organization defines an emergency as the state in which normal procedures are interrupted, and immediate measures need to be taken to prevent that state turning into a disaster. Thus, emergency management is crucial to avoid the disruption transforming into a disaster, which is even harder to recover from.
1_Apprentice
That does sound nasty, can people see them? Or are they microscopic?