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Study finds park design affects cooling differently by day and night

Phys · · 557 words · By Émilie Hervieux
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What to know about Study finds park design affects cooling differently by day and night

Researchers from Concordia University studied 13 parks in Montreal to determine how tree arrangement affects urban cooling. The study found that while dense tree clusters provide maximum cooling during the day, open grass areas allow for faster heat release at night, suggesting that structural diversity in park design is optimal for round-the-clock thermal comfort.

Propaganda risk 0%
Claims checked 8
Techniques found 0
Topics 0

Coverage spectrum

Coverage gap: Low Left coverage
Left0%
Center75%
Right25%

4 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

Study finds park design affects cooling differently by day and night Sadie Harley Scientific Editor Andrew Zinin Lead Editor Urban parks are often seen as natural refuges from summer heat, but new Concordia research shows that, depending on the time of day,…

Why it matters

In a paper published in Urban Forestry and Urban Greening, researchers studied air temperature and humidity in 13 parks across Montreal to understand how different tree planting patterns affect daytime and nighttime cooling.

Common ground

"We often assume that more trees always mean cooler conditions," says lead author Lingshan Li, a Ph.D.

Perspective signals

No major persuasion pattern has been attached yet, so the source, headline, and evidence should carry most of the weight for readers.

Researchers from Concordia University studied 13 parks in Montreal to determine how tree arrangement affects urban cooling. The study found that while dense tree clusters provide maximum cooling during the day, open grass areas allow for faster heat release at night, suggesting that structural diversity in park design is optimal for round-the-clock thermal comfort.

open_in_new Read the original article: https://phys.org/news/2026-04-affects-cooling-differently-day-night.html

analyticsAnalysis

0%
Propaganda Score
confidence: 100%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkClaims Checked

eFinder analyzed this article and checked 8 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

info Single Source 6
check_circle Corroborated 2
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Claim 1: “Lingshan Li et al, Tree presence and level of aggregation in urban parks are associated with opposite daytime and nighttime urban cooling, Urban Forestry & Urban Greening (2025). DOI: 10.1016/j.ufug.2025.129159”
CORROBORATED
The title of the paper, the journal 'Urban Forestry & Urban Greening', and the general subject matter are confirmed across multiple independent web search results.
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wikipedia NEUTRAL — An urban forest is a forest, or a grove of trees, that grow within a city, town or a suburb. In a wider sense, it may include any kind of woody plant vegetation growing in and around human settlements…
https://en.wikipedia.org/wiki/Urban_forest
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wikipedia NEUTRAL — Urban forestry is the care and management of single trees and tree populations in urban settings for the purpose of improving the urban environment. Also called urban tree canopy, urban forestry invol…
https://en.wikipedia.org/wiki/Urban_forestry
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wikipedia NEUTRAL — Urban reforestation is the practice of planting trees, typically on a large scale, in urban environments. It may also include urban horticulture and urban farming.
https://en.wikipedia.org/wiki/Urban_reforestation
+ 3 more evidence sources
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Claim 2: “humidity moderated many of the temperature differences between park areas”
SINGLE SOURCE
The provided evidence includes general definitions of humidity and its effects on temperature, but no specific evidence from the study or other sources confirms that humidity moderated the temperature differences in these specific parks.
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web search NEUTRAL — Humidity indicates the likelihood for precipitation, dew, or fog to be present. Humidity depends on the temperature and pressure of the system of interest. The same amount of water vapor results in hi…
https://en.m.wikipedia.org/wiki/Humidity
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web search NEUTRAL — 23 hours ago · Current weather in Portland, OR. Check current conditions in Portland, OR with radar, hourly, and more.
https://www.accuweather.com/en/us/portland/97209/current-wea…
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web search NEUTRAL — Jul 3, 2024 · On a hot day, high relative humidity can make it feel significantly warmer than it actually is, while on a cool day, low absolute humidity can make the air feel crisper and drier. Unders…
https://science.howstuffworks.com/nature/climate-weather/atm…
info
Claim 3: “large, aggregated tree clusters provided the strongest cooling during the day”
SINGLE SOURCE
The specific finding that large, aggregated tree clusters provide the strongest daytime cooling is mentioned in one specific web search result summarizing the study.
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web search NEUTRAL — The climates that are hot during the day and cool at night are usually also low humidity climates, such that the other aspect of air conditioning--dehumidification--can be ignored.
https://www.greenbuildingadvisor.com/article/passive-cooling…
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web search NEUTRAL — They found that large, aggregated tree clusters provided the strongest cooling during the day, thanks to shade and evapotranspiration, the combined processes which move water from Earth's surface into…
https://phys.org/news/2026-04-affects-cooling-differently-da…
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web search NEUTRAL — Trees, which provide shade and act as natural air conditioners…Apart from providing shade, trees cool cities through the process of transpiration, in which water is absorbed through the roots and push…
https://theconversation.com/trees-are-a-citys-air-conditione…
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Claim 4: “open grass areas were often hotter during sunny daytime conditions—sometimes even warmer than nearby paved surfaces”
SINGLE SOURCE
The specific claim that open grass areas can be warmer than paved surfaces during the day is mentioned in one web search result summarizing the study. Other results discuss general heat properties of grass vs concrete but do not confirm this specific study's finding.
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web search NEUTRAL — Different surfaces also cool at different rates. Short grass, soil and vegetation lose heat more quickly than materials such as concrete or roads, which retain warmth for longer. As a result, grass fr…
https://www.metoffice.gov.uk/blog/2026/why-frost-can-still-o…
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web search NEUTRAL — On the other hand, for paved surfaces better cooling from the dense shade of linden trees are more effective. As Mohammad Rahman summarized: "On very hot days, city dwellers have a cooler time on gras…
https://www.sciencedaily.com/releases/2018/04/180423085409.h…
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web search NEUTRAL — CREDIT: NOAA. What the ground is made of also plays an effect. Concrete and asphalt are physically warmer than areas with grass or trees. That’s why walking around the city on a fall day generally can…
https://www.popsci.com/environment/why-fall-feels-colder-tha…
info
Claim 5: “these areas [open grass areas] cooled down more quickly once the sun set”
SINGLE SOURCE
The finding that open grass areas cool more rapidly after sunset is mentioned in one web search result summarizing the study. Other results for 'open' are dictionary definitions.
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web search NEUTRAL — 1 day ago · The meaning of OPEN is having no enclosing or confining barrier : accessible on all or nearly all sides. How to use open in a sentence. Synonym Discussion of Open.
https://www.merriam-webster.com/dictionary/open
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web search NEUTRAL — Find the latest Opendoor Technologies Inc. (OPEN) stock quote, history, news and other vital information to help you with your stock trading and investing.
https://finance.yahoo.com/quote/OPEN/?fr=sycsrp_catchall
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web search NEUTRAL — OPEN definition: 1. not closed or fastened: 2. ready to be used or ready to provide a service: 3. not closed in or…. Learn more.
https://dictionary.cambridge.org/dictionary/english/open
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Claim 6: “Lingshan Li, a Ph.D. candidate in the Department of Geography, Planning and Environment [is the lead author]”
CORROBORATED
Multiple independent web sources confirm Lingshan Li is a Ph.D. candidate in the Department of Geography, Planning and Environment and the lead author of the study.
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wikipedia NEUTRAL — Shaolin Monastery (少林寺; shàolín-sì), also known as Shaolin Temple, is a Mahayana Buddhist monastic institution recognized as the birthplace of Chan Buddhism and the cradle of Shaolin kung fu. It is lo…
https://en.wikipedia.org/wiki/Shaolin_Monastery
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wikipedia NEUTRAL — About 30 subspecies of common pheasant (Phasianus colchicus) are currently accepted by major ornithological authorities, revealing a pronounced geographic variability of this species. The geographic v…
https://en.wikipedia.org/wiki/Subspecies_of_Phasianus_colchi…
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web search NEUTRAL — "We often assume that more trees always mean cooler conditions," says lead author Lingshan Li, a Ph.D. candidate in the Department of Geography, Planning and Environment.
https://phys.org/news/2026-04-affects-cooling-differently-da…
+ 2 more evidence sources
info
Claim 7: “those same dense clusters slowed heat release after sunset, keeping temperatures higher at night”
SINGLE SOURCE
The finding that dense clusters slow heat release at night is mentioned in one specific web search result summarizing the study. Other results for 'dense' are dictionary definitions.
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web search NEUTRAL — 4 days ago · The meaning of DENSE is marked by compactness or crowding together of parts. How to use dense in a sentence. Synonym Discussion of Dense.
https://www.merriam-webster.com/dictionary/dense
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web search NEUTRAL — DENSE definition: having the component parts closely compacted together; crowded or compact. See examples of dense used in a sentence.
https://www.dictionary.com/browse/dense
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web search NEUTRAL — DENSE meaning: 1. having parts that are close together so that it is difficult to go or see through: 2. (of a…. Learn more.
https://dictionary.cambridge.org/us/dictionary/english/dense
info
Claim 8: “In a paper published in Urban Forestry and Urban Greening, researchers studied air temperature and humidity in 13 parks across Montreal”
SINGLE SOURCE
While the study title and author are mentioned in web results, the specific detail about '13 parks across Montreal' is not explicitly confirmed by the provided evidence snippets, though it is consistent with the context of the other claims.
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wikipedia NEUTRAL — Forest management is a branch of forestry concerned with overall administrative, legal, economic, and social aspects, as well as scientific and technical aspects, such as silviculture, forest protecti…
https://en.wikipedia.org/wiki/Forest_management
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wikipedia NEUTRAL — Land use, land-use change, and forestry (LULUCF), also referred to as forestry and other land use (FOLU) or agriculture, forestry and other land use (AFOLU), is defined as a "greenhouse gas inventory …
https://en.wikipedia.org/wiki/Land_use,_land-use_change,_and…
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wikipedia NEUTRAL — Urban agriculture is the practice of cultivating, processing and distributing food in or around urban areas. It is the growing of fresh produce within the city for individual, communal or commercial p…
https://en.wikipedia.org/wiki/Urban_agriculture_by_region
+ 3 more evidence sources
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.