The overwhelming scientific consensus according to more than 99.9 percent of peer-reviewed studies is clear – climate change is real and man-made (1). Climate change results in increased flooding, record heatwaves, stronger hurricanes, and longer, more extreme wildfire seasons that all directly affect our welfare (2)(3)(4).
Climate change is predicted to have devastating long-term effects on human health and safety. Regional impacts provided by the Intergovernmental Panel on Climate Change include (5):
- abrupt ecosystem shifts
- species extinction
- reduced snow cover
- greater risk of flash flooding
- reduced agricultural output for a growing population
- more intense, prolonged heatwaves
- increased droughts
What is the connection between air pollution and climate change?
The key driver of climate change is air pollution caused by methane emissions and fossil fuel burning, gas-phase air pollution. These two environmental hazards are deeply intertwined and must be addressed together.
The consequences of climate change are dire and the need for mitigating action is urgent. Because the connection between air pollution and climate change is well-established, it’s critical to understand the complex interaction between pollutants and our environment, how that leads to climate change, and what can be done about it.
Key pollutants affecting poor air quality and climate change
How greenhouse gases and particulate matter differ
Air pollutants come in two physical states: solid, particulate matter and gas-phase pollutants. Gas-phase pollutants, such as greenhouse gases (GHGs) consist of methane, nitrous oxides, and carbon dioxide. These gas pollutants enter the Earth’s atmosphere in unprecedented concentrations, causing our planet’s climate system to change.
When greenhouse gases absorb radiation, they also trap the sun’s heat and stop them from entering space. This creates a greenhouse effect; the effect is like a blanket wrapping around the Earth, trapping heat and causing the planet to warm up (6).
Notably, many significant air pollutants like PM2.5 aren’t gases – they’re tiny particles. PM2.5 are particle pollutants measuring 2.5 microns in diameter or less. The chemistry surrounding PM2.5 is not as dynamic and volatile as gas-phase pollutants. Nevertheless, particulate pollution can deeply harm human health. In fact, over 7 million people die every year due to mainly particulate matter pollution, as it is linked to increased heart and lung illnesses and other serious health effects.
Because of these differences, most governments write laws and develop policy separating greenhouse gas emissions (also known as gas-phase air pollution) and particulate matter air pollution.
How air pollution affects weather patterns
Hotter temperatures impact heatwave length and intensity, wildfire frequency, and increase air pollution. Increased heat and sunlight generate higher concentrations of ozone, a gas which forms through a combination of volatile organic compounds (VOCs) and nitrogen oxides chemically interacting with sunlight. Ground-level ozone is also called smog. This is different from the “ozone layer,” high up in the Earth’s atmosphere that protects us from the sun’s harmful rays (7).
While ground ozone by itself is a pollutant, heat has the added impact of increasing particle pollutants. By drying out plants and soil, high heat increases dust circulation and creates conditions favorable for wildfires. A careless camper in a back country forest or lightning strikes can spark massive infernos, which then carry smoke for hundreds or thousands of miles.
Can air pollution affect the weather (meteorology)?
There are many ways in which air pollution directly impacts the weather.
Higher concentrations of particle pollution can affect cloud formation. When there are moderate concentrations of particle pollutants, water condenses onto the particles. Clouds become taller, creating more intense rainfall, thunderstorms, and lightning. This can also alter traditional rainfall patterns, with significant potential consequences (8).
For example, when an area has experienced long periods of drought and vegetation is dry, storms can ignite brush. It’s often lightning strikes that spark wildfires, which leads to noxious wildfire smoke and particulate matter.
If there is an extreme concentration of particle pollution – as may be found in smoke – those concentrations can block sunlight and cool the earth’s surface. This inhibits cloud formation and growth, preventing rainfall.
The double threat: Black carbon and arctic ice melt
Particulate matter itself can affect global warming in various ways, depending on its composition. In general, light-colored particles will reflect sunlight away from and cool the earth. Dark particles absorb heat, having a warming effect. Sulphates and nitrates are light particles which cool; black carbon absorbs heat.
Black carbon is a type of particle pollution that comes from burning fossil fuels and biomass, and it contributes to warming by absorbing sunlight. It can have a particularly negative effect when it settles on Arctic ice, which accelerates melting.
In a similar way, the more Arctic ice that melts, the less white space exists to reflect sunlight and heat away from Earth – so this contributes doubly toward global warming.
Both black carbon and ozone trap heat in the atmosphere, resulting in warmer global temperatures.
How Reducing Air Pollution Helps Fight Climate Change
The stakes are high in reducing air pollution and mitigating climate change. Air pollution directly impacts our ability to breathe and live healthy lives. Reducing climate change severity is the key to maintaining a sustainable planet for future generations. The science connecting these environmental issues demands an approach that addresses both problems at the same time.
Often, air pollution and greenhouse gas emissions come from many of the same sources. Significant contributors to both include carbon-based fuel combustion, combustion that results in vehicle and industrial emissions.
Both issues can often be combated simultaneously by reducing harmful emissions and lowering our carbon footprint.
We can reduce our carbon footprint on a personal level and through advocacy for national and international cooperation in reducing carbon emissions.
Many countries have pledged to meet goals in reducing emissions through international treaties like the 2015 Paris Agreement (9). But we also know that no country in the world is meeting the World Health Organization’s recently updated guidance to reduce their annual average PM2.5 concentrations to 5 µg/m3 or less (micrograms per cubic meter of air).
Until countries set their national policies with that goal in mind, particle pollutant levels will remain above safe levels for human health – and will continue to have an impact on climate change.
What you can do today
We can each pledge to take meaningful steps to lower our personal carbon footprint in many ways:
- When possible, walk to stores and restaurants rather than taking the car – or carpool.
- When buying a new vehicle, choose a fuel-efficient, hybrid, or electric vehicle.
- Install solar power energy for your home or business.
You can play an active role in raising air pollution awareness by providing your community with a low-cost air quality monitor. Air quality monitors can notify you and anyone following your station when air quality falls below safe standards, empowering you to take immediate action like closing windows, wearing a mask outdoors, or running a high-efficiency air purifier.
Get involved in your community
There are other steps you can take to improve air quality in your community.
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Join local workshops and events to educate others about the importance of reducing air pollution and combatting climate change.
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Get involved with local environmental groups or initiatives to reduce emissions and improve air quality.
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Schools4Earth: Engage with schools and educational institutions to incorporate environmental education programs like Schools4Earth, which empower students to take action on climate change and air pollution.
Advocate for change
Change begins at home, but you can also help improve air quality on a larger scale.
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Petition your representatives for stronger national standards on PM2.5 levels and greenhouse gas emissions.
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Support policies that aim to reduce air pollution and mitigate climate change.
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Advocate for legislation that caps greenhouse gas emissions and promotes the use of renewable energy sources.
How individual actions help drive global change
Individual actions can collectively drive significant global change by influencing communities, corporations, and governments to improve air quality and reduce greenhouse gas emissions.
One way to directly help raise air quality awareness - by publicly sharing air quality data. Air quality monitors provide real-time data to raise awareness about local pollution sources and enable quick response to poor air quality events.
Air quality data contributors can help their neighbors better understand the air they breathe all over the world by:
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Shining a light on Milwaukee's most polluted communities.
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Teaching the next generation of environmental activists in Bangkok, Thailand.
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Filling gaps in air quality knowledge in Ghana's Volta Region.
The takeaway
As awareness of the link between air pollution and climate change grows, it’s increasingly important for policymakers to make the connection between the common sources of these problems and find solutions that address both urgent issues.
We can all help prevent air pollution and climate change as well. Through our individual choices and advocacy, we can reduce emissions, help ourselves, and help our planet at the same time.
