nitrogen oxides
Smog-forming exhaust gases
Nitrogen oxides are a group of gases formed when nitrogen and oxygen combine, typically during combustion at high temperatures.
The term usually refers to nitric oxide and nitrogen dioxide, which contribute to smog, acid rain, and respiratory problems.
Vehicle exhaust and power plants are major sources.
Often abbreviated NOx in environmental and regulatory contexts: NOx emissions standards.
Sunlight-activated urban pollution
- particulatesMinute airborne solids or droplets
- air qualityPollution level measurement
- emissionsSubstances released into air
- ozoneTriatomic oxygen allotrope
respiratory · asthma · inhalation · toxicity · environmental health · vehicular · industrial · scrubber
SO₂ gas compound
- pHMeasure of solution acidity
- leachingDissolving out by liquid
- eutrophicationExcess nutrients depleting oxygen
- forest declineWidespread tree death phenomenon
liming · precipitation · fish kill · watershed · aquatic ecosystems
Machine producing motion
- ignitionStarting combustion process
- flameBurning gas made visible
- fuelEnergy source material
- oxidationLosing electrons chemically
thermal · exhaust · diesel · gasoline · turbine · furnace · boiler · hydrocarbon
Emissions that trap heat
- global warmingRising planetary temperatures
- ozone depletionProtective atmospheric layer destruction
- emissions tradingMarket-based pollution control
- carbon footprintTotal greenhouse gases produced
fossil fuels · methane · CO2 · Paris Agreement · IPCC · stratosphere · climate policy · Kyoto Protocol
smog
Sunlight-activated urban pollution
- particulatesMinute airborne solids or droplets
- air qualityPollution level measurement
- emissionsSubstances released into air
ozone · respiratory · asthma · inhalation · toxicity · environmental health · vehicular · industrial · scrubber · sulfur dioxide
sulfur dioxide
SO₂ gas compound
- pHMeasure of solution acidity
- leachingDissolving out by liquid
- eutrophicationExcess nutrients depleting oxygen
forest decline · liming · precipitation · fish kill · watershed · aquatic ecosystems
engine
Machine producing motion
oxidation · thermal · exhaust · diesel · gasoline · turbine · furnace · boiler · hydrocarbon · carbon monoxide
greenhouse gases
Emissions that trap heat
- global warmingRising planetary temperatures
- ozone depletionProtective atmospheric layer destruction
- emissions tradingMarket-based pollution control
carbon footprint · fossil fuels · methane · CO2 · Paris Agreement · IPCC · stratosphere · climate policy · Kyoto Protocol
nitrogen oxidescarbon monoxide
Toxic combustion byproduct gas
particulate matter · ozone · carbon dioxide · ammonia · hydrogen sulfide
nitrogen oxidesclean air
Uncontaminated breathable gas
fresh air · zero emissions · ammonia · pure oxygen · inert gases
oxygen, nitroglycerin, nitrogen, nitrate, oxygenate, nitrous, nitrile, oxygenation, nitrite