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  • 文章类型: Journal Article
    目的:创伤并发症已成为全球最严重的公共卫生问题之一。在大多数报告中,泌尿生殖道损伤(UGI)见于约10%的成人创伤患者和少于3%的腹部或骨盆多发/严重创伤儿童。交通事故是UGI最常见的原因。这项研究的目的是系统地确定车祸后UGI的患病率和类型。
    方法:搜索策略旨在于2023年10月寻找相关研究。没有语言或日期限制。以下标准被认为是资格标准:报告道路交通伤害(RTI)人群中UGI的至少一个流行病学方面,并对UGI中的RTI进行单独的流行病学分析(我们还包括那些指出所有RTI但单独提及UGI的文章)。两名专家使用JoannaBriggs研究所的标准化关键评估工具评估了文章的报告质量。使用CMA统计软件3.2.0版进行本研究的统计分析。
    结果:共有1,466,024例RTIs通过107项研究纳入我们的综述。其中,29项研究与儿童有关(20,036),其他人报告了成人的RTI(1,445,988)。总患病率为4.7%,在36项研究中,车祸是原因,其次是25起摩托车事故,17起自行车事故,以及23项相关研究中的汽车-行人碰撞。在基于受损器官的亚组分析中,膀胱损伤率为3.5%。肾脏的这一比率为5.3%。
    结论:这项系统综述和荟萃分析发现,RTIs后UGI的患病率为4.7%,车祸是最常见的原因。UGI在成人中比在儿童中更普遍,膀胱和肾脏损伤是最常见的报告类型。UGI的患病率因国家和研究设计而异。
    OBJECTIVE: Trauma complications have been one of the most serious public health concerns worldwide. In most reports, urogenital injuries (UGIs) are seen in approximately 10% of adult traumatic patients and less than 3% of children with multiple/severe trauma to the abdomen or pelvis. Traffic accidents are the most common cause of UGIs. The purpose of this study is to systematically determine the prevalence and types of UGIs after car accidents.
    METHODS: The search strategy was aimed at finding relevant studies in October 2023. No restrictions on language or date were applied. The following criteria were considered eligibility criteria: reporting at least one epidemiological aspect of UGIs in people with road traffic injury (RTI) and a separate epidemiological analysis of RTIs in UGI (we also included those articles that pointed out all RTIs but separately mentioned UGIs). Two experts assessed the reporting quality of articles using standardized critical appraisal instruments from the Joanna Briggs Institute. Statistical analysis for this study was conducted using the CMA statistical software version 3.2.0.
    RESULTS: A total of 1,466,024 cases following RTIs through 107 studies were included in our review. Of these, 29 studies were related to children (20,036), and the others reported RTIs in adults (1,445,988). The total prevalence was 4.7%, and car accidents were responsible in 36 studies, followed by motorcycle accidents in 25, bicycles in 17 studies, and automobile-pedestrian collisions in 23 related studies. In subgroup analysis based on the damaged organ, the rate of bladder injury was 3.5%. This rate was 5.3% for kidneys.
    CONCLUSIONS: This systematic review and meta-analysis found that the prevalence of UGI following RTIs was 4.7%, with car accidents being the most common cause. UGIs were more prevalent in adults than in children, and bladder and kidney injuries were the most commonly reported types. The prevalence of UGI varied by country and study design.
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  • 文章类型: Journal Article
    TRPM4是钙激活的非选择性阳离子通道,不透Ca2+,在神经元中,它与兴奋性的调节和持续的放电有关。胆碱能刺激也涉及兴奋性的变化,导致神经元的放电频率增加,然而,目前尚不清楚TRPM4是否参与胆碱能引起的放电频率增加.这里使用膜片钳电生理学的组合,Ca2+成像,免疫荧光,光漂白后的荧光恢复(FRAP)和药理学方法,我们证明了卡巴胆碱(Cch)增加了发射频率,细胞内Ca2和使用9-Ph和CBA的TRPM4抑制降低了放电频率,并降低了Cch在培养的皮质锥体神经元中诱导的细胞内Ca2的峰值。此外,我们确定胆碱能刺激会降低TRPM4的再循环并稳定血浆膜中的TRPM4.我们的结果共同表明胆碱能刺激以TRPM4依赖的方式增加放电,并且还增加了TRPM4在膜中的稳定性,这表明TRPM4被锁定在膜的微区中,可能是信号或细胞骨架蛋白复合物。
    TRPM4 is a calcium activated non-selective cation channel, impermeable to Ca2+, in neurons it has been implicated in the regulation of the excitability and in the persistent firing. Cholinergic stimulation is also implicated in changes in excitability that leads neurons to an increased firing frequency, however it is not clear whether TRPM4 is involved in the cholinergic-induced increase in firing frequency. Here using a combination of patch clamp electrophysiology, Ca2+ imaging, immunofluorescence, fluorescence recovery after photobleaching (FRAP) and pharmacological approach, we demonstrate that carbachol (Cch) increases firing frequency, intracellular Ca2+ and that TRPM4 inhibition using 9-Ph and CBA reduces firing frequency and decreases the peak in intracellular Ca2+ induced by Cch in cortical pyramidal neurons in culture. Moreover, we determined that cholinergic stimulation reduces TRPM4 recycling and stabilizes TRPM4 in the plasma membrane. Together our results indicate that cholinergic stimulation increases firing in a TRPM4 dependent manner, and also increases the TRPM4 stability in the membrane, suggesting that TRPM4 is locked in microdomains in the membrane, possibly signaling or cytoskeleton proteins complexes.
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  • 文章类型: Journal Article
    目标:道路交通伤害(RTIs)构成了重大的公共卫生负担,其中一半以上的死亡归因于弱势道路使用者(VRU)。本研究旨在通过关注不同类型的道路使用者来评估韩国严重RTI的流行病学和结果。
    方法:这是一项全国性的回顾性观察研究。使用韩国全国严重创伤登记处的数据,本研究分析了2016年至2020年的严重RTI病例.这项研究包括EMS治疗的严重创伤患者,将严重RTI定义为损伤严重程度评分(ISS)≥16或院外心脏骤停(OHCA)的病例。感兴趣的主要变量是道路用户类型,分类为机动车乘员(MVOs),行人,摩托车手,和骑自行车的人。分析了道路使用者类型的趋势和伤害特征,我们进行了多因素逻辑回归,以计算住院死亡率的道路使用者类型的校正比值比(AORs)和95%置信区间(CIs).
    结果:在143,021例EMS治疗的严重创伤病例中,本研究包括24,464。行人占最大的群体(n=8,782;35.9%)。超过一半的患者死亡(n=12,620,51.6%),高比例的患者患有OHCA(n=10,048,41.1%)。从2016年到2020年,严重RTI的总体数量没有显着变化,但行人病例减少,摩托车手病例增加(趋势均<0.05)。观察到安全装置的使用率较低(28.2%的机动车乘员使用安全带,35.9%的电单车司机使用头盔,和9.6%的骑自行车的人使用头盔)。头部受伤最常见,特别是骑自行车的人(77.0%)和骑摩托车的人(69.8%)。与机动车乘员相比,行人(AOR[95%CI]1.12[1.04-1.20])和其他人(AOR[95%CI]1.30[1.02-1.65])的死亡率较高,而摩托车手(AOR[95%CI]0.64[0.59-0.69])和自行车手(AOR[95%CI]0.68[0.60-0.76])的死亡率较低.
    结论:根据道路使用者类型,我们发现严重RTI的趋势和损伤特征各不相同。针对不断变化的道路使用者模式调整预防策略,特别注意增加安全装置的使用和解决与严重RTI相关的高死亡率是必要的。
    OBJECTIVE: Road traffic injuries (RTIs) pose a significant public health burden, and more than half of these fatalities are attributed to vulnerable road users (VRUs). This study aimed to evaluate the epidemiology and outcomes of severe RTIs in Korea by focusing on different types of road users.
    METHODS: This is nationwide retrospective observational study. Using data from the Korean Nationwide Severe Trauma Registry, this study analyzed severe RTI cases from 2016 to 2020. The study included EMS-treated severe trauma patients, defining severe RTI as cases with an injury severity score (ISS) ≥16 or out-of-hospital cardiac arrest (OHCA). The main variable of interest was the road user type, classified as motor vehicle occupants (MVOs), pedestrians, motorcyclists, and bicyclists. Trends and injury characteristics by road user type were analyzed, and multivariate logistic regression was conducted to calculate the adjusted odds ratios (AORs) and 95 % confidence intervals (CIs) of road user type for in-hospital mortality.
    RESULTS: Of the 143,021 EMS-treated severe trauma cases, 24,464 were included in this study. Pedestrians represented the largest group (n = 8,782; 35.9 %). More than half of the patients died (n = 12,620, 51.6 %), and a high proportion of patients had OHCA (n = 10,048, 41.1 %). There was no significant change in the overall severe RTI numbers from 2016 to 2020, but a decrease in pedestrian cases and an increase in motorcyclist cases were noted (both p for trend<0.05). Low usage of safety devices was observed (28.2 % of motor vehicle occupants used seat belts, 35.9 % of motorcyclists used helmets, and 9.6 % of bicyclists used helmets). Head injuries were most common, particularly among bicyclists (77.0 %) and motorcyclists (69.8 %). Compared to motor vehicle occupants, pedestrians (AOR [95 % CI] 1.12 [1.04-1.20]) and others (AOR [95 % CI] 1.30 [1.02-1.65]) had higher odds of mortality, while motorcyclists (AOR [95 % CI] 0.64 [0.59-0.69]) and bicyclists (AOR [95 % CI] 0.68 [0.60-0.76]) had lower odds of mortality.
    CONCLUSIONS: We found varying trends and injury characteristics in severe RTIs according to road user type. Adapting prevention strategies for evolving road user patterns, with particular attention to increasing safety device usage and addressing the high mortality associated with severe RTIs are warranted.
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  • 文章类型: Journal Article
    视觉语言模型在各个领域都很有趣,包括自动驾驶,计算机视觉技术可以准确检测道路使用者,但是车辆有时无法理解上下文。这项研究检查了GPT-4V在预测人类评估的交通图像中“风险”水平方面的有效性。我们使用了从移动车辆上拍摄的210张静态图像,每个人以前被大约650人评级。基于心理测量学建构理论,运用自我一致性提示方法的见解,我们提出了三个假设:(I)在有效相同的条件下重复提示增加了有效性,(ii)与使用单个提示相比,改变提示文本并提取总分增加了有效性,和(Iii)在多元回归分析中,结合对象检测特征,除了基于GPT-4V的风险评级,显著有助于提高模型的有效性。有效性通过与人类风险评分的相关系数量化,在210张图片中。结果证实了这三个假设。最终的有效性系数为r=0.83,表明可以使用AI高度准确地预测人口水平的人类风险。研究结果表明,GPT-4V必须以等同于人类填写多项目问卷的方式进行提示。
    Vision-language models are of interest in various domains, including automated driving, where computer vision techniques can accurately detect road users, but where the vehicle sometimes fails to understand context. This study examined the effectiveness of GPT-4V in predicting the level of \'risk\' in traffic images as assessed by humans. We used 210 static images taken from a moving vehicle, each previously rated by approximately 650 people. Based on psychometric construct theory and using insights from the self-consistency prompting method, we formulated three hypotheses: (i) repeating the prompt under effectively identical conditions increases validity, (ii) varying the prompt text and extracting a total score increases validity compared to using a single prompt, and (iii) in a multiple regression analysis, the incorporation of object detection features, alongside the GPT-4V-based risk rating, significantly contributes to improving the model\'s validity. Validity was quantified by the correlation coefficient with human risk scores, across the 210 images. The results confirmed the three hypotheses. The eventual validity coefficient was r = 0.83, indicating that population-level human risk can be predicted using AI with a high degree of accuracy. The findings suggest that GPT-4V must be prompted in a way equivalent to how humans fill out a multi-item questionnaire.
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  • 文章类型: Journal Article
    背景:创伤在伊朗是一个重要的公共卫生问题,死亡率和发病率高。这项研究旨在评估沙鲁德创伤患者的概况,伊朗。研究设计:横断面研究。
    方法:该研究涉及在Shahroud的ImamHossein医院符合特定标准的创伤患者,伊朗,在2016年至2023年之间,使用伊朗国家创伤登记处(NTRI)。采用卡方检验和事后分析分析损伤特征与损伤原因的关系。Quintile回归模型评估了人口统计学和临床变量与住院时间的关联。
    结果:在3513例创伤患者中,与跌倒(0.3%)相比,格拉斯哥昏迷量表(GCS)中道路交通事故(RTC)的受伤比例在9~12(1.7%)之间(P<0.001).与RTC(17.1%)相比,跌倒引起的伤害严重程度评分(ISS)为9至15(22.7%)的中度病例更多(P<0.001)。与RTC相关的损伤需要更多的通气(2.7%)和重症监护病房(ICU)入院(11.1%),而不是跌倒(P<0.001)。在调整了年龄之后,GCS,ISS,和身体区域,跌倒的中位住院时间比RTC短9小时(95%CI=-16.2,-1.8).
    结论:在RTC和跌倒之间观察到了显著的损伤模式差异。RTC的损伤频率较高,导致GCS评分在9到12之间,而跌倒的ISS评分中等的频率较高。此外,RTC相关损伤患者需要更多的机械通气和ICU入住.此外,在对各种因素进行调整后,与跌倒相关损伤患者相比,RTC相关损伤患者的住院时间明显更长.
    BACKGROUND: Trauma is a significant public health concern in Iran, with high mortality and morbidity rates. This study aimed to assess trauma patients\' profiles in Shahroud, Iran. Study Design: A cross-sectional study.
    METHODS: The study involved trauma patients who met specific criteria at Imam Hossein hospital in Shahroud, Iran, between 2016 and 2023, using the National Trauma Registry of Iran (NTRI). The relationship between injury characteristics and the cause of injury was analyzed using chi-square test and post hoc analysis. Quintile regression models assessed the association of demographic and clinical variables with length of stay.
    RESULTS: Among 3513 trauma patients, road traffic crashes (RTCs) had a higher percentage of injuries with the Glasgow Coma Scale (GCS) between 9 and 12 (1.7%) compared to falls (0.3%) (P<0.001). Falls caused more moderate cases with injury severity scores (ISS) ranging from 9 to 15 (22.7%) than RTCs (17.1%) (P<0.001). RTC-related injuries required more ventilation (2.7%) and intensive care unit (ICU) admissions (11.1%) than falls (P<0.001). After adjusting for age, GCS, ISS, and body region, fall had a median length of stay nine hours shorter than RTCs (95% CI = -16.2, -1.8).
    CONCLUSIONS: Significant injury pattern differences were observed between RTCs and falls. RTCs had higher frequencies of injuries resulting in GCS scores between 9 and 12, while falls had higher frequencies of moderate ISS scores. In addition, patients with RTC-related injuries required more mechanical ventilation and ICU admissions. Moreover, after adjusting for various factors, patients with RTC-related injuries had a significantly longer hospital stay compared to those with fall-related injuries.
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  • 文章类型: Journal Article
    背景:哮喘患者不成比例地受到空气污染的影响,症状加重,药物使用,入院,和死亡的风险。迄今为止,一直关注废气排放,但与交通相关的空气污染(TRAP)也可能来自轮胎的机械磨损,刹车,和路面。因此,我们创建了一项研究,旨在研究非废气排放(NEEs)对哮喘成人肺功能和气道免疫状态的急性影响。
    方法:随机三条件交叉小组设计将在伦敦的三个地点使用随机顺序的2.5小时间歇循环方案暴露患有哮喘的成年人。选择以在TRAP中的NEE组件中提供最大的对比度。将使用示波法监测肺功能,呼出气一氧化氮,和肺活量测定(主要结果是一秒内的用力呼气量)。使用鼻灌洗在上呼吸道中测量炎症和空气中金属暴露的生物标志物。将使用问卷监测症状反应。废气和非废气浓度的来源将通过在暴露地点进行的高时间分辨率化学措施的正矩阵分解,使用来源分配来确定。
    结论:总的来说,这项研究将为我们提供有关环境PM2.5和PM10中NEE成分对健康的影响的有价值的信息,同时建立一种生物学机制来帮助了解当前的流行病学观察。
    BACKGROUND: People living with asthma are disproportionately affected by air pollution, with increased symptoms, medication usage, hospital admissions, and the risk of death. To date, there has been a focus on exhaust emissions, but traffic-related air pollution (TRAP) can also arise from the mechanical abrasion of tyres, brakes, and road surfaces. We therefore created a study with the aim of investigating the acute impacts of non-exhaust emissions (NEEs) on the lung function and airway immune status of asthmatic adults.
    METHODS: A randomised three-condition crossover panel design will expose adults with asthma using a 2.5 h intermittent cycling protocol in a random order at three locations in London, selected to provide the greatest contrast in the NEE components within TRAP. Lung function will be monitored using oscillometry, fractional exhaled nitric oxide, and spirometry (the primary outcome is the forced expiratory volume in one second). Biomarkers of inflammation and airborne metal exposure will be measured in the upper airway using nasal lavage. Symptom responses will be monitored using questionnaires. Sources of exhaust and non-exhaust concentrations will be established using source apportionment via the positive matrix factorisation of high-time resolution chemical measures conducted at the exposure sites.
    CONCLUSIONS: Collectively, this study will provide us with valuable information on the health effects of NEE components within ambient PM2.5 and PM10, whilst establishing a biological mechanism to help contextualise current epidemiological observations.
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  • 文章类型: Journal Article
    研究的目的是评估受工业人为压力影响的地区土壤中的锑源的污染水平和识别:运输,冶金和电气废物回收利用。土壤磁力测量的组合,使用原子光谱(ICP-OES和ICP-MS)进行化学分析,Sb分馏分析,统计分析(皮尔逊相关矩阵,因子分析)以及地质累积指数,污染负荷指数,和Sb/As因子不仅允许评估土壤污染程度,还可以对不同的Sb源进行综合鉴定。结果表明,研究对象附近的土壤具有较高的磁化率,因此,高含量的潜在有毒元素。污染最严重的地区是电气废物处理厂附近。研究表明,道路交通和制动块磨损的影响,即一般的交通人为压迫,锑含量对周围土壤影响不大。大量的Pb,Zn,在锌铅矿石处理后,在堆附近收集的土壤中发现了As和Cd,堆附近的平均锑(11.31mgkg-1)含量低于电气和电子废物处理厂周围地区,但仍然很高。研究土壤中的锑已复员,主要与残留部分有关。
    The aim of the study was an assessment of the pollution level and identification of the antimony sources in soils in areas subjected to industrial anthropopressure from: transport, metallurgy and electrical waste recycling. The combination of soil magnetometry, chemical analyzes using atomic spectrometry (ICP-OES and ICP-MS), Sb fractionation analysis, statistical analysis (Pearson\'s correlation matrix, factor analysis) as well as Geoaccumulation Index, Pollution Load Index, and Sb/As factor allowed not only the assessment of soil contamination degree, but also comprehensive identification of different Sb sources. The results indicate that the soil in the vicinity of the studied objects was characterized by high values of magnetic susceptibility and thus, high contents of potentially toxic elements. The most polluted area was in the vicinity of electrical waste processing plants. Research has shown that the impact of road traffic and wearing off brake blocks, i.e. traffic anthropopression in general, has little effect on the surrounding soil in terms of antimony content. Large amounts of Pb, Zn, As and Cd were found in the soil collected in the vicinity of the heap after the processing of zinc-lead ores, the average antimony (11.31 mg kg-1) content was lower in the vicinity of the heap than in the area around the electrical and electronic waste processing plant, but still very high. Antimony in the studied soils was demobilized and associated mainly with the residual fraction.
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  • 文章类型: Journal Article
    全世界青少年发病率和死亡率的主要原因之一是机动车事故(MVA)。安全带的使用显着降低了MVA的死亡和伤害。这项研究的目的是调查青少年安全带的使用方式及其与危险行为的关系。这项研究是在两家医疗机构进行的,他们的非移民和有文化的青少年年龄在12-18岁之间。人口统计,安全带使用,并通过问卷调查收集冒险行为。726名青少年(422名女孩和304名男孩),平均年龄为176.7±23.37个月。父母的教育水平和前排安全带的使用被发现是相关的。与非用户相比,安全带使用者表现出较低的风险评分(总计,交通,实质,和社交)。交通风险显著预测了安全带的使用,根据逻辑回归。社会经济地位较高的城市参与者使用安全带的频率较高。因此,研究发现,表现出更多危险行为的青少年使用安全带的频率较低,而使用安全带与社会经济水平和父母教育水平相关。人们认为,对这一主题进行的基于人群的研究很重要。
    The one of the leading causes of adolescent morbidity and mortality worldwide is motor vehicle accidents (MVA). The use of seat belts significantly lowers MVA fatalities and injuries. The aim of this study is to investigate adolescent seat belt usage patterns and relation with risky behaviors. The study conducted at two medical institutions with non-immigrant and literate adolescents aged 12-18. Demographics, seat belt use, and risk-taking behavior were collected through questionnaires. 726 teenagers (422 girls and 304 boys) with an average age of 176.7 ± 23.37 months participated in the study. Parents\' educational levels and front-seat belt use have been found to be correlated. Comparatively to non-users, seat belt users demonstrated lower risk scores (total, traffic, substance, and social). The use of seat belts was significantly predicted by traffic risk, according to logistic regression. The frequency of seatbelt use was higher among participants from cities with higher socioeconomic status. As a result, it was found that adolescents who exhibited more risky behaviors had a lower frequency of seat belt use and seat belt use was associated with socioeconomic level and parental education level. It is thought that population-based studies to be conducted on this subject are important.
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  • 文章类型: Journal Article
    与交通有关的空气污染是围产期健康的主要问题。确定因果关系,然而,是困难的,因为高交通地区往往与较低的社会经济社区和其他环境暴露相对应。为了克服混乱,我们比较了生活在同一条交通繁忙道路的顺风和逆风的孕妇。我们利用了2007-2016年德克萨斯州的重要统计数据(n=3,570,272例出生),并计算了500m交通繁忙道路内住宅地址的每小时风力估计(即,年平均每日交通量大于25,000)(占出生人口的10.9%)。我们将主要是逆风的孕妇与同一路段的顺风的孕妇邻居进行了匹配(n=37,631对)。顺风生活与足月出生体重减轻11.6克(95%CI:-18.01,-5.21)相关。没有观察到与低足月出生体重的关联,早产,或者非常早产。在距离分层模型中,生活在50m以内的顺风与足月出生体重下降-36.3克(95%CI:-67.74,-4.93)相关,生活在51-100m顺风与早产的比值比为3.68(95%CI:1.71,7.90)相关.这些结果表明交通空气污染与不良分娩结局有关,主要道路周围有陡峭的距离衰减梯度。
    Traffic related air pollution is a major concern for perinatal health. Determining causal associations, however, is difficult since high-traffic areas tend to correspond with lower socioeconomic neighborhoods and other environmental exposures. To overcome confounding, we compared pregnant individuals living downwind and upwind of the same high-traffic road. We leveraged vital statistics data for Texas from 2007-2016 (n=3,570,272 births) and computed hourly wind estimates for residential addresses within 500 m of high-traffic roads (i.e., annual average daily traffic greater than 25,000) (10.9% of births). We matched pregnant individuals predominantly upwind to pregnant neighbors downwind of the same road segment (n=37,631 pairs). Living downwind was associated with an 11.6 gram (95% CI: -18.01, -5.21) decrease in term birth weight. No associations were observed with low term birth weight, preterm birth, or very preterm birth. In distance-stratified models, living downwind within 50 m was associated with a -36.3 gram (95% CI: -67.74, -4.93) decrease in term birth weight and living 51-100m downwind was associated with an odds ratio of 3.68 (95% CI: 1.71, 7.90) for very preterm birth. These results suggest traffic air pollution is associated with adverse birth outcomes, with steep distance decay gradients around major roads.
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  • 文章类型: Journal Article
    空气污染是一个主要的环境问题,其监测对于监管目的至关重要,政策制定,保护公众健康。然而,由于设备成本,密集的空气质量监测设备网络过于昂贵,劳动力要求,基础设施需求。因此,替代低成本的方法,可靠地确定空气质量水平附近的强效污染源,如高速公路是可取的。我们提出了一种将噪声频率测量与机器学习相结合的方法,以估计附近的道路颗粒物(PM2.5)。二氧化氮(NO2),和黑碳(BC)在1分钟的时间分辨率。这些模型是基于长滩繁忙高速公路附近共同定位的噪声和空气质量仪器收集的数据,加州这三种污染物的模型性能都很好,例如,NO2预测得出Pearson的R=0.87,均方根误差为7.2ppb;该误差约占早晨高峰时间总浓度的10%。最佳的空气污染物预测指标是40Hz的噪声频率,500Hz,和800Hz,和气象学,尤其是风向。总的来说,我们的方法可能提供了一种具有成本效益和有效的方法来以高时间分辨率估算和/或补充城市地区的近路空气污染物浓度。
    Air pollution is a major environmental problem and its monitoring is essential for regulatory purposes, policy making, and protecting public health. However, dense networks of air quality monitoring equipment are prohibitively expensive due to equipment costs, labor requirements, and infrastructure needs. As a result, alternative lower-cost methods that reliably determine air quality levels near potent pollution sources such as freeways are desirable. We present an approach that couples noise frequency measurements with machine learning to estimate near-roadway particulate matter (PM2.5), nitrogen dioxide (NO2), and black carbon (BC) at 1-min temporal resolution. The models were based on data collected by co-located noise and air quality instruments near a busy freeway in Long Beach, California. Model performance was excellent for all three pollutants, e.g., NO2 predictions yielded Pearson\'s R = 0.87 with a root mean square error of 7.2 ppb; this error represents about 10 % of total morning rush hour concentrations. Among the best air pollutant predictors were noise frequencies at 40 Hz, 500 Hz, and 800 Hz, and meteorology, particularly wind direction. Overall, our method potentially provides a cost-effective and efficient approach to estimating and/or supplementing near-road air pollutant concentrations in urban areas at high temporal resolution.
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