masseffect

Environmental hazards usually occur on planets with hostile environments.

Mass Effect

EVA Hazards

Noveria is classified as a Level 1 cold hazard.
Noveria is classified as a Level 1 cold hazard.

Some worlds are dangerous to explore on foot, either from extreme conditions, radiation, pressure or biological contamination. The dangers are ranked as Levels 1, 2, and 3 and are listed on the planet's description on the Galaxy Map. Upon exiting the Mako's environmentally sealed interior, a hazard timer will begin to fill, with the rate of fill being faster with a higher hazard level. When the hazard meter is full, the character will begin taking health damage until death occurs. The timer can be reset by entering the Mako or large structures; small portable cabins do not guard against a hazardous environment. If it is necessary to spend an extended period on foot some hazards can be negated entirely by wearing Devlon Industries's Armor; if any member of the squad is wearing such armor, it will negate the timer on environments with Level 1 environmental hazards and slow down the timer on Level 2 for the entire party.

Common hazards include:

Legendary Edition: In Mass Effect Legendary Edition, lava is now rendered as a Level 8 generic hazard. The Mako no longer suffers instant destruction on encountering molten lava, but now takes rapid damage over time. Characters are still instantly killed. For whatever reason, the lava encountered on Nonuel still instantly destroys the Mako.

EVA Hazards are encountered in the following locations:

Cluster System Planet Hazard Hazard Level
Attican Beta Hercules Eletania Toxic Level 1
Gemini Sigma Han Mavigon Cold Level 2†
Argos Rho Hydra Metgos Heat Level 2
Hades Gamma Plutus Nonuel Heat Level 1
Horse Head Nebula Pax Noveria Cold Level 1
Artemis Tau Macedon Sharjila Pressure Level 1
Armstrong Nebula Grissom Solcrum Heat Level 1
Artemis Tau Knossos Therum n/a Level 8††
Horse Head Nebula Strenuus Xawin Cold Level 1

†Mavigon's hazard level is incorrectly listed in the planet description as Level 1.
††Mass Effect Legendary Edition only.

Interior Hazards

Environmental damage applies not only to EVAs, but interior hazards like falling boxes, or exploding power junctions which cause toxic damage if destroyed in close proximity. Another danger is from containment cells, often found in mercenary bases, mines or derelict starships:

On all worlds, fires are ranked as Level 2 or 3 hazards, depending on the size of the fire, and ignore shields. Getting too close to one will destroy a character's health very quickly.

Mass Effect: Andromeda

Mass Effect: Andromeda returns to the hazard system found in Mass Effect. However, this time the ND1 Nomad vehicle will take damage from environmental hazards unlike the M35 Mako.

Overview

Planets and certain areas contain hazards that damage Pathfinder Ryder and the ND1 Nomad. (Any point past this, "Ryder" refers to both Pathfinder Ryder and the Nomad unless otherwise specified.)

MEA Life Support With Hazard Level 1

Fires, lava, burning sulfur, Scourge tendrils, electric ferrofluid, lightning bolts, electric discharges, toxic ooze, as well as other hazards found during exploration and missions, tend to be high level hazards that quickly deplete Life Support. Don't assume that the cool looking animation is just a background element.

Displayed Hazard Values

Displayed hazard values (as well as safe conditions) have slight variations/fluctuations. The on screen display may say Hazard Level 1 - TEMPERATURE 50.98°C in one location but if Ryder walks into a safe zone and enters another Hazard Level 1 area this new area may display TEMPERATURE 50.94°C. Just like the real world, there are minor normal fluctuations in the measurement of a variable. The only thing to take note of is that the Hazard encountered is a Level 1 hazard and that it causes slow damage over time to Life Support. Hazards don't magically change from one level to another over time but stay fixed for the locations in which they are encountered. Note: Actions that change the conditions of a planet such as activating a vault will change the hazard values.

The only exception to the displayed hazard values rule is for the Level 4 hazards. These numbers may be wildly different but will ALWAYS be serious trouble. Heat Hazard Level 4 for a burning fire - TEMPERATURE 124.56°C is just as deadly as molten lava - TEMPERATURE 1,231.97°C.

Another thing of note is that very few of the displayed values make scientific sense regarding their effects on Ryder. Temperatures between 30°C and 50°C above or below zero certainly are challenging to the human body, but even today some well-chosen basic clothing is sufficient to protect the wearer from the worst of their effects for hours, if not days on end. Similarly, the Level 1 and 2 Radiation Hazards show dosage values far too low to induce even the mildest symptoms of radiation poisoning in human physiology regardless of clothing, and common OSHA-compliant insulating clothing would neutralize the majority of electrical and toxic hazards as displayed. A trained fighter like Ryder who is also clad in sophisticated powered armor should not be bothered by most the displayed environmental hazards at all except for the rare Level 4 examples, much less killed by them after a maximum of 15 minutes of exposure.

Planets

Planets that Pathfinder Ryder can visit each have their own environmental hazards prior to the activation of the Remnant vault. Once the vault is activated, the Hazard Levels will be removed (or reduced).

Planet Hazard Detailed
Hazard
Details Vault Mission
Elaaden Heat Heat Levels Any location not in permanent deep shade or indoors will cause constant damage to Life Support. Taming a Desert
Eos Radiation Radiation Levels Any location outside of specially shielded areas will cause constant damage to Life Support. A Better Beginning
H-047c Radiation Radiation Levels Unlike other planets, the radiation on H-047c is high enough that Pathfinder Ryder can't leave the Nomad. Any time that the Nomad is outside of the protection of a shielded area, the Nomad takes constant damage to Life Support. N/A
Havarl None N/A Havarl doesn't have an environmental hazard. A Dying Planet
Kadara Toxic Toxic Levels Unlike other planets, the damage to Life Support only occurs if Ryder enters a sulfur water pool. Healing Kadara's Heart
Voeld Cold Cold Levels Any location not heated or indoors will cause constant damage to Life Support. Restoring a World

Note: H-047c has no vault so the Hazard Level can't be reduced.
Note: Unlike other planets, Voeld only has a partial reduction in Hazard Level and not a complete removal of the Hazard Level like other planets.