20年或更老的汽油和柴油动力汽车使加州人暴露在严重的有害空气污染中,尽管它们在道路上的乘用车中只占相对较小的一部分.
此外, the harm falls disproportionately on 拉丁美洲人 and Black Californians, 低收入家庭, and communities the state designates as disadvantaged. To ensure that all Californians have access to cleaner transportation options, 忧思617888九五至尊娱乐家联盟和绿线研究所建议对州政策和项目进行以下调整:
- 优先考虑现有的激励计划, such as Clean Cars 4 All and the Clean Vehicle Assistance Program, 优先考虑拥有旧车的人群.
- 针对旧车密集地区和零排放车辆有限地区的家庭进行宣传和教育.
- Provide transportation solutions that go beyond private passenger vehicles.
- 根据电动汽车市场的变化评估和调整激励方案.
更清洁的汽车,更清洁的空气
This is a condensed, online version of the report. For all figures, references, and the full text, please download the full report PDF.
由于道路上的交通污染,加州的空气质量一直很差. 早在1966年, 该州的617888九五至尊娱乐, 地理位置, 大量的车辆导致加州启动了减少乘用车和卡车污染的监管行动. As a result of continuing progress on regulations, 目前在售的新乘用车的空气污染物排放量远低于旧车辆.
汽油车的排放直接或间接地产生细颗粒物, 定义为空气中小于2的颗粒.直径5微米. 简称PM2.5, these particles are small enough to penetrate deeply into the lungs; some can even enter the bloodstream. 慢性暴露于PM2.5 causes increased death rates attributed to cardiovascular diseases, 包括心脏病发作, and it has been linked to lung cancer and other adverse impacts. 妊娠期和儿童期长期接触也与肺功能发育减慢和哮喘的发展有关, 对健康的其他负面影响.
加州道路上的一小部分车辆,旧车和卡车比新车污染更严重
从2004年开始, 加州对乘用车实施了最新的低排放车辆(LEVII)尾气排放标准,要求大幅减少空气污染排放. 旧车辆(2004年以前)占该州乘用车的19%,行驶里程仅占12%, 然而,它们排放的氮氧化物污染物几乎是2004年及以后所有汽车排放总量的三倍. 汽车排放的氮氧化物占乘用车排放总量的73%,活性有机气体占64%(表1)。. These pollutants can react in the atmosphere to form harmful PM2.5 污染.
尽管在加州道路上行驶的车辆中,老旧车辆只占不到五分之一, 它们产生的氮氧化物和活性有机气体排放量比所有新型汽车的总和还要多.
Exposure to Harmful Air Pollution from Older Vehicles Is Inequitably Distributed
Using the InMAP air-quality model and data from the California Air Resources Board, 忧思617888九五至尊娱乐家联盟(UCS)和Greenlining研究所(Greenlining)估计了PM的形成和运输2.5 使用旧乘用车(定义为1976年至2003年车型)和新乘用车(2004年至2021年车型)造成的污染.1 结合PM2.5 污染物浓度与美国人口普查数据, 我们估计了加州人暴露在旧车造成的有害空气污染中的情况.
我们的分析表明PM2.5 在加州,使用2004年以前的车辆的风险在种族和人口群体中分布不均. All of the areas with the highest exposure to PM2.5 老旧车辆的车辆分布在加州南部,主要集中在洛杉矶中部. The communities with the highest 污染 burden due to PM2.5 来自老旧车辆的家庭比例是全州平均水平的两倍多,与没有这些车辆造成空气污染的地区相比,低收入和中等收入家庭的比例更高.
In the parts of the state with the highest exposure to PM 2.5 由于老旧车辆造成的污染,超过一半的家庭年收入低于6万美元. 在暴露最少的地区, only 35 percent of households have an income of less than $60,000元/年(图1). On average, higher-income households are exposed to lower concentrations of PM2.5 所有乘用车造成的污染. 收入较高的家庭也较少接触到旧车造成的污染.
![图显示pm 2.5 污染 from older cars and household income in California](/sites/default/files/styles/original/public/2023-05/cleaner-cars-cleaner-air-figure-1_0.png?itok=9iN_vJ7M)
我们还发现了乘用车空气污染暴露的种族和民族差异. 这些差异在老旧车辆的污染上也比整个车队的污染更大. 与所有乘用车和卡车相比,白人接触到的PM浓度低17%2.5 低于州平均水平, 而拉丁裔加州人的暴露浓度高出13%,黑人加州人的暴露浓度高出11%.2
只看旧车的污染情况, White Californians are on average exposed to 20 percent lower concentrations of PM 2.5 低于州平均水平. 拉丁美洲人 Californians are exposed to 19 percent higher concentrations, and Black Californians are exposed to 12 percent higher concentrations.
接触PM最多的社区2.5 这是该州平均水平的两倍多,这里的黑人和拉丁裔人口比例远高于整个州. 在这些暴露率最高的地区, 67 percent of residents are 拉丁美洲人 and 8 percent are Black; the state as a whole is 40 percent 拉丁美洲人 and 5 percent Black. 与此形成鲜明对比的是, those same areas of highest exposure are only 13 percent White; the state is 36 percent White (Figure 2).
![图显示pm 2.5 污染 from older cars and race/ethnicity in California](/sites/default/files/styles/original/public/2023-05/cleaner-cars-cleaner-air-figure-2_1.png?itok=w-ar48yv)
进一步, 加州人已经面临着来自所有来源的最严重污染,他们还面临着旧车辆排放的首当其冲. 增加接触PM 2.5 旧车污染与社区在CalEnviroScreen上的得分相关.0, 一种筛选方法,有助于确定受到多种污染源不成比例负担的社区. 人 in the highest-scoring (most-burdened) census tracts in CalEnviroScreen 4.他们暴露在老旧车辆污染浓度的环境中,是得分最低的人口普查区的两倍.
Estimating Premature Deaths Due to Pollution from Older Vehicles
评估PM对健康的影响2.5 污染 exposure resulting from older vehicles, we examined two scenarios considering the emissions from engine starts, 蒸发排放, 和驾驶. These scenarios provided a range for the estimated premature deaths in California. 一种方案只考虑冷启动排放,并假设这些排放发生在车辆注册的地方. 第二种情况假设所有尾气排放都发生在车辆注册的地方. 我们估计,旧车排放导致每年97到421人过早死亡. 影响主要集中在南加州,尤其是洛杉矶县.
Rural Areas Have a Higher Proportion Of Older Vehicles
而南加州的城市地区拥有最多的老旧车辆(也暴露在由此产生的污染中), rural areas have higher proportions of older vehicles. 例如, 在摩多克农村, 三一, Sierra县, over 40 percent of vehicles are model year 2003 or older. 与此形成鲜明对比的是, 橙色, 旧金山, 和河滨县, 这些城市都更加城市化, have the lowest percentages of older cars in the state.3
Recommendations: Policies to Reduce Inequitable Exposure to Pollution
Based on the impacts of older cars on local air quality and public health, 因此,加州的相关机构必须优先考虑淘汰和更换老旧车辆. Policymakers should also ensure that programs provide direct, measurable and meaningful benefits to disadvantaged and low-income communities. 此外, 在制定新政策和项目时, 加州应该以有意义的方式让受旧车排放影响最大的社区参与进来. 这将有助于该州找到减少旧乘用车污染不公平分配的方法.
UCS和Greenlining建议对州政策和计划进行以下更改:
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Prioritize incentives 优先考虑拥有旧车的人群. 州政府机构应该对现有的激励方案进行计划性改革, such as Clean Cars 4 All and the Clean Vehicle Assistance Program, 优先投资于旧车高度集中的低收入和弱势社区.
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在旧车高度集中的地区进行有意的、有针对性的推广和教育. 州和地方机构应该将有限的推广和教育资金用于旧车密集地区的家庭,而零排放汽车的普及程度却很低.
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Provide transportation solutions that go beyond private passenger vehicles. Even as California attempts to reduce vehicle miles traveled, it continues to invest in vehicle incentive programs that prioritize car ownership. 各机构应考虑进一步为促进替代交通方式的项目提供资金, 比如公共交通, 走, 汽车共享, 和(e -)骑自行车.
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根据电动汽车市场的变化评估和调整激励方案. 尽管电动汽车价格不断下降, 新冠肺炎疫情对电动汽车供应的影响为购买新电动汽车和二手电动汽车制造了障碍. 加州应该继续评估和调整其激励计划,以根据人们的需求最好地帮助他们. 而从长远来看,完全转向零排放技术将会发生, 电动汽车的价格和有限的供应可能会使他们在短期内更难购买. 因此, 国家不应该阻止司机转向其他类型的更清洁、更便宜的燃料汽车, 即使不是零排放.
结论
A cleaner, safer transportation future for all Californians is possible. To realize it, the state must commit to retiring the dirtiest vehicles on the road. 通过持续投资和有针对性的政策, California can protect its vulnerable communities from harmful air 污染, 节省金钱和生命.
尾注
1We excluded vehicles older than 1976; our input sources lacked detailed data on vehicles manufactured before 1976. The newest vehicles in the dataset were model year 2021.
2 这份报告使用拉丁裔这个词来描述对美国人口普查问题“这个人是西班牙裔吗?”回答“是”的人, 拉丁美洲人, 或者西班牙血统?" The census collected race data in a separate question. The term White describes persons answering "no" to the Hispanic, 拉丁美洲人, 或者西班牙种族问题,在回答“这个人是什么种族”时选择“白人”?" The term Black describes persons answering "no" to the Hispanic, 拉丁美洲人, or Spanish question and choosing "Black or African Am.回答“这个人是什么种族??"
3 有关污染浓度及车辆分布的地图,可于 http://blog.yingla.net/dave-reichmuth/cleaner-cars-cleaner-air.
This is a condensed, online version of the report. For all figures, references, and the full text, please download the full report PDF.