Eczema
Eczema is a group of inflammatory skin conditions, often used for atopic dermatitis, that can cause dry, itchy, irritated, and recurring rashes.
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Anaphylaxis
Anaphylaxis is a sudden, severe allergic reaction that can affect breathing, circulation, skin, and digestion and requires urgent emergency response.
Allergies
Allergies happen when the immune system reacts to a substance that is usually harmless, causing symptoms that can range from mild irritation to life-threatening anaphylaxis.
Asthma
Asthma is a chronic lung disease in which airways can become inflamed and narrow, causing episodes of wheezing, coughing, chest tightness, and shortness of breath.
Ventilation
Ventilation is the intentional movement of outdoor air into a space and stale indoor air out, helping dilute pollutants, moisture, odors, and airborne particles.
Mold
Mold is a type of fungus that grows where moisture and organic material meet, making it an important indoor air quality and building moisture issue.
Radon
Radon is a naturally occurring radioactive gas that can enter buildings from soil and rock, creating an indoor air risk that can only be known by testing.
Indoor air quality
Indoor air quality describes the air inside homes, schools, offices, and other buildings, including pollutants, ventilation, moisture, and health-related comfort.
Acid rain
Acid rain is acidic wet or dry deposition formed when sulfur dioxide and nitrogen oxides react in the atmosphere and return to Earth.
Sulfur dioxide
Sulfur dioxide is a reactive gas from sulfur-containing fuels and industrial processes that can affect breathing, form fine particles, and contribute to acid rain.
Nitrogen dioxide
Nitrogen dioxide is a reddish-brown reactive gas from combustion that can irritate airways and help form ozone and particle pollution.
Carbon monoxide
Carbon monoxide is a colorless, odorless gas from incomplete combustion that can poison people indoors and also appears in outdoor air quality monitoring.
Ozone
Ozone is a reactive form of oxygen that protects life high in the stratosphere but can harm lungs and vegetation when it forms near the ground.
Particulate matter
Particulate matter is a mixture of tiny solid particles and liquid droplets in the air, including dust, soot, smoke, and fine particles that can affect health.
Air quality index
The air quality index, or AQI, translates outdoor air pollution levels into color-coded health guidance so people can adjust activity and reduce exposure.
Lightning
Lightning is a giant electrical discharge in the atmosphere, usually produced by thunderstorms when separated charges build until air breaks down.
Thunderstorms
Thunderstorms are convective storms with lightning and thunder, powered by rising moist unstable air and capable of heavy rain, hail, damaging wind, and tornadoes.
Tornadoes
Tornadoes are violently rotating columns of air connected to thunderstorms and the ground, capable of intense winds, flying debris, and narrow but destructive damage paths.
Fog
Fog is a low cloud at the ground, made of tiny water droplets or ice crystals that can sharply reduce visibility and disrupt travel.
Clouds
Clouds are visible collections of tiny water droplets or ice crystals suspended in the atmosphere, shaping weather, precipitation, sunlight, and climate.
Dew point
Dew point is the temperature air must be cooled to for water vapor to saturate and begin condensing, making it a practical measure of atmospheric moisture.
Atmospheric pressure
Atmospheric pressure is the force of air pressing on a surface, shaped by the weight, motion, temperature, and density of the atmosphere above us.
Ice storms
Ice storms happen when freezing rain coats roads, trees, power lines, and buildings with glaze ice, creating dangerous travel and outage hazards.
Snow squalls
Snow squalls are brief, intense bursts of heavy snow and gusty wind that can make visibility and road conditions collapse within minutes.
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