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Yes, wildfire smoke can contribute to ground-level ozone that harms trees’ photosynthesis downwind. But the often-cited estimate of ozone-related carbon loss in tropical forests is a model of anthropogenic ozone broadly—not a measurement of carbon uptake lost specifically to Amazon wildfires. The evidence supports a real pathway from fire emissions to ozone exposure and plant damage, while leaving the size of any wildfire-only effect on Amazon trees unquantified.
How wildfire emissions can become ozone
Wildfires release nitrogen oxides (NOx) and volatile organic compounds (VOCs). In the atmosphere, these gases can react to form ground-level ozone downwind of the fire. Ozone is therefore not simply a component of smoke: it can form from smoke’s precursor gases as the plume travels.
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The Science Panel for the Amazon’s Amazon Assessment Report 2021 describes wet-season background ozone below 20 parts per billion by volume (ppbv), and observations of 40–80 ppbv downwind of biomass-burning plumes in the dry season. Those are reported concentrations in particular seasons and plume conditions, not a year-round reading for the Amazon.
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How ozone can affect surviving trees
Ground-level ozone can enter leaves through stomata—the pores that regulate gas exchange. Once inside, it can impair photosynthesis, reducing the carbon a plant takes in and uses to grow. Ozone exposure does not affect all species equally: controlled work on tropical trees found substantial variation in susceptibility.
#1 Best Overall
- High Precision Ozone Monitoring: Thanks to the electrochemical sensor, this ozone detector can accurately measure ozone concentration from 0-20 PPM with a resolution of 0.01 PPM. High accurate readings of O3 levels make it reliable for detecting ozone air in various environments
- Rechargeable & Long-Lasting: As a rechargeable ozone meter, built-in a 2500 mAh high-capacity battery. Once fully charged, this O3 monitor can continuously operate for up to 16 hours. Whether you’re at home or on the go, allowing you to use the ozone detector anytime and anywhere
- Portable w/ Alarm Protection: This ozone gas detector has three alarm modes, including vibration, sound and flashing lights. The alarm limit value for O3 gas air quality is adjustable. It has a rapid response and can effectively alert you to the leak of ozone gas until the gas concentration is at a safe level
- Multi-Function Ozone Monitor: This ozone gas meter can accurately detect gas/ozone while also keeping track of the ambient temperature (℃/℉) and humidity. Feature manual/auto power off optional to save your battery, also it can record up to 1000 pieces of data for easy ozone monitoring
- Convenient to Use: Ozone gas concentration, Maximum O3 meter values, Temp, and humidity on 2.8” bright backlit LCD screen at the same time. Come with a convenient carrying case and back clip design makes it easy to carry and use
A 2018 global modeling study by Yue and Unger describes the same stomatal pathway. It also points to a countervailing effect: fire aerosols can scatter sunlight and increase diffuse radiation, which may help photosynthesis in some conditions. In the study’s global simulations for 2002–2011, ozone dampened productivity in unburned forests and masked the diffuse-light benefit, resulting in a net indirect terrestrial carbon loss. The balance depends on location and conditions; it does not mean every plume causes the same net effect on every forest. Read the study in Nature Communications.
What the tropical-forest carbon estimate actually says
Cheesman and colleagues’ 2024 study combined open-top-chamber experiments on ten tropical-forest tree species with the JULES dynamic global vegetation model. The experiments measured how plant biomass related to estimated ozone entering leaves. The model then used the observed range of tree susceptibility to estimate the effects of spatially explicit post-industrial atmospheric ozone change from 1900 to 2014. The resulting productivity figures concern tropical forests as a whole, not the Amazon alone, and the ozone forcing was anthropogenic ozone generally rather than ozone attributed only to fires.
Rank #2
- High Precision Ozone Monitoring: Thanks to the electrochemical sensor, this ozone detector can accurately measure ozone concentration from 0-20 PPM with a resolution of 0.01 PPM. High accurate readings of O3 levels make it reliable for detecting ozone air in various environments
- Rechargeable & Long-Lasting: As a rechargeable ozone meter, built-in a 2500 mAh high-capacity battery. Once fully charged, this O3 monitor can continuously operate for up to 16 hours. Whether you’re at home or on the go, allowing you to use the ozone detector anytime and anywhere
- Portable w/ Alarm Protection: This ozone gas detector has three alarm modes, including vibration, sound and flashing lights. The alarm limit value for O3 gas air quality is adjustable. It has a rapid response and can effectively alert you to the leak of ozone gas until the gas concentration is at a safe level
- Multi-Function Ozone Monitor: This ozone gas meter can accurately detect gas/ozone while also keeping track of the ambient temperature (℃/℉) and humidity. Feature manual/auto power off optional to save your battery, also it can record up to 1000 pieces of data for easy ozone monitoring
- Convenient to Use: Ozone gas concentration, Maximum O3 meter values, Temp, and humidity on 2.8” bright backlit LCD screen at the same time. Come with a convenient carrying case and back clip design makes it easy to carry and use
| Study result | What it represents | How to interpret it |
|---|---|---|
| For 2005–2014, modeled tropical-forest net primary productivity (NPP) was reduced by an average of 5.1% under moderate ozone susceptibility; the range was 3.4–9.6% under the study’s low-to-high susceptibility assumptions. | A vegetation-model estimate based on tropical-tree experiments and historical anthropogenic ozone forcing. | It is not a field measurement of Amazon trees or an estimate of the share caused by wildfire smoke. Cheesman et al., Nature Geoscience (2024). |
| The authors calculated a cumulative carbon-drawdown loss of 0.29 petagrams of carbon (PgC) per year since 2000, equivalent to about 17% of the contemporary annual tropical land carbon sink in the twenty-first century. | The study’s modeled carbon-drawdown estimate for tropical forests under its ozone analysis. | This is a tropical-wide modeled comparison, not a current annual Amazon wildfire impact. Cheesman et al., Nature Geoscience (2024). |
The authors note that the influence of elevated ozone on tropical forests had remained unclear. Their work adds experimental evidence about tropical tree sensitivity and a model-based estimate of the broader effect; it does not isolate the contribution of Amazon fires.
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What Amazon carbon-budget measurements add—and do not add
A separate analysis by Basso and colleagues used an atmospheric CO2 inversion incorporating Amazon vertical-profile observations and global flask measurements to estimate the region’s carbon balance for 2010–2018. It found a mean net carbon source of 0.13 ± 0.17 Pg C per year. Estimated fire emissions were 0.26 ± 0.13 Pg C per year, while forest uptake was −0.13 ± 0.20 Pg C per year—offsetting around half of those fire emissions. The authors found no significant trend over 2010–2018 in total, fire, or net biome exchange estimates, and said the analysis could not provide clear evidence of weakening Amazonian forest carbon uptake. Read the study record at NOAA.
Rank #3
- High Precision Ozone Monitoring: Thanks to the electrochemical sensor, this ozone detector can accurately measure ozone concentration from 0-100 PPM with a resolution of 0.01 PPM. High accurate readings of O3 levels make it reliable for detecting ozone air in various environments
- Rechargeable & Long-Lasting: As a rechargeable ozone meter, built-in a 2500 mAh high-capacity battery. Once fully charged, this O3 monitor can continuously operate for up to 16 hours. Whether you’re at home or on the go, allowing you to use the ozone detector anytime and anywhere
- Portable w/ Alarm Protection: This ozone gas detector has three alarm modes, including vibration, sound and flashing lights. The alarm limit value for O3 gas air quality is adjustable. It has a rapid response and can effectively alert you to the leak of ozone gas until the gas concentration is at a safe level
- Multi-Function Ozone Monitor: This ozone gas meter can accurately detect gas/ozone while also keeping track of the ambient temperature (℃/℉) and humidity. Feature manual/auto power off optional to save your battery, also it can record up to 1000 pieces of data for easy ozone monitoring
- Convenient to Use: Ozone gas concentration, Maximum O3 meter values, Temp, and humidity on 2.8” bright backlit LCD screen at the same time. Come with a convenient carrying case and back clip design makes it easy to carry and use
This inversion is a regional carbon-budget analysis, not a test of ozone’s physiological effect on individual trees. It helps prevent a different overstatement: the ozone study does not establish that the Amazon’s overall carbon sink is currently weakening because of wildfire-generated ozone.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What can be concluded
- Amazon biomass burning can release ozone precursors, and elevated ozone has been observed downwind of dry-season plumes.
- Ozone can enter leaves and reduce photosynthesis, with effects that vary among tree species.
- Tropical-forest modeling estimates an ozone-related productivity and carbon-drawdown cost, but does not assign that cost specifically to Amazon wildfires.
- Fire aerosols can also affect light in ways that may partly offset ozone’s productivity impact; the net outcome varies with conditions.
The evidence therefore supports the narrower claim that wildfire pollution can expose surviving Amazon trees to ozone that may impair productivity. It does not establish how much carbon uptake Amazon trees have lost to fire-derived ozone, or what the local effect is today. The 2024 ozone model uses historical forcing through 2014, and the separate Amazon carbon inversion covers 2010–2018; neither is a current 2026 air-quality or tree-uptake measurement.
Quick Recap
Best Value
- The air quality monitor features a 2.8in LCD display with high definition colour screen showing gas concentrations, temperature, humidity values and graphical interface.
- Gas exceeds the standard alarm peak buzzer ringing, digital change colour, you can set the alarm value of the gas by yourself.
- Data saving function (can store 100000 pieces of data), set the timer to store, delete data, view historical data.
- The display brightness can be adjusted from 5% to 100%, the default brightness is 60% at power on, and the temperature can be switched between Celsius ℃ and Fahrenheit ℉.
- Air quality monitor comes with a rugged case, easy to carry around and use in different environments, both indoors and outdoors.
Rank #4
- 【Professional 10-in-1 Air Quality Monitor】This professional 10-in-1 air quality monitor accurately measures carbon dioxide (CO2), formaldehyde (HCHO), total volatile organic compounds (TVOC), temperature, humidity, AQI, PM2.5, PM1.0, PM10 in real time, and features a clock (Connect your phone to the monitor via Bluetooth: MT13S, and it will automatically calibrate the time). It helps you keep track of your indoor air quality at a glance, making it ideal for home use.
- 【3-Color Visualization System】This CO2 detector features a high-definition color screen that displays data in real time, ensuring clear readings. It provides a comprehensive assessment of air quality and tracks the average concentration of each gas, enabling data visualization. When air quality exceeds safety thresholds, the screen intelligently changes color, allowing potential air quality risks to be detected immediately—even from a distance.
- 【High Accuracy and Reliability】Built with a high-performance smart chip and advanced sensor array, this tester adopts dedicated intelligent sensing technology for CO2 detection, paired with precision electrochemical sensors for HCHO and TVOC monitoring. Unlike ordinary detectors, it features smart calibration and stable sensitivity, ensuring long-term accurate data output without frequent manual adjustments.
- 【Simple Operation】Air Quality Tester: Press and hold the "Power button" for 3 seconds to turn the air quality monitor on or off, and it automatically initiates full-range detection the moment it’s turned on; and press once to switch temperature settings ℃/℉; press twice to turn the sound on or off; press 3 times to enter the calibration mode; press 4 times to put the screen to sleep(then press once to wake the screen). You can calibrate the time by connecting your phone to the MT13S via Bluetooth.
- 【Wide Range of Applications】This compact and portable indoor air quality monitor can measure air quality in bedrooms, living rooms, kitchens, offices, cars, schools, hotels, basements, restaurants, campsites, and other environments. It is suitable for use in homes, vehicles, grow rooms, maternity and infant care rooms, and public spaces.
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