Do the Health Benefits of Cycling Outweigh the Risks?

BACKGROUND: Although from a societal point of view a modal shift from car to bicycle may have beneficial health effects due to decreased air pollution emissions, decreased greenhouse gas emissions, and increased levels of physical activity, shifts in individual adverse health effects such as higher exposure to air pollution and risk of a traffic accident may prevail.Objective: We describe whether the health benefits from the increased physical activity of a modal shift for urban commutes outweigh the health risks. DATA SOURCES AND EXTRACTION: We have summarized the literature for air pollution, traffic accidents, and physical activity using systematic reviews supplemented with recent key studies. DATA SYNTHESIS: We quantified the impact on all-cause mortality when 500,000 people would make a transition from car to bicycle for short trips on a daily basis in the Netherlands. We have expressed mortality impacts in life-years gained or lost, using life table calculations. For individuals who shift from car to bicycle, we estimated that beneficial effects of increased physical activity are substantially larger (3-14 months gained) than the potential mortality effect of increased inhaled air pollution doses (0.8-40 days lost) and the increase in traffic accidents (5-9 days lost). Societal benefits are even larger because of a modest reduction in air pollution and greenhouse gas emissions and traffic accidents. CONCLUSIONS: On average, the estimated health benefits of cycling were substantially larger than the risks relative to car driving for individuals shifting their mode of transport

Comparative evaluation of the effects of short-term inhalation exposure to diesel engine exhaust on rat lung and brain

Combustion-derived nanoparticles, such as diesel engine exhaust particles, have been implicated in the adverse health effects of particulate air pollution. Recent studies suggest that inhaled nanoparticles may also reach and/or affect the brain. The aim of our study was to comparatively evaluate the effects of short-term diesel engine exhaust (DEE) inhalation exposure on rat brain and lung. After 4 or 18 h recovery from a 2 h nose-only exposure to DEE (1.9 mg/m(3)), the mRNA expressions of heme oxygenase-1 (HO-1), inducible nitric oxide synthase (iNOS), cyclooxygenase-2 (COX-2), and cytochrome P450 1A1 (CYP1A1) were investigated in lung as well as in pituitary gland, hypothalamus, olfactory bulb, olfactory tubercles, cerebral cortex, and cerebellum. HO-1 protein expression in brain was investigated by immunohistochemistry and ELISA. In the lung, 4 h post-exposure, CYP1A1 and iNOS mRNA levels were increased, while 18 h post-exposure HO-1 was increased. In the pituitary at 4 h post-exposure, both CYP1A1 and HO-1 were increased; HO-1 was also elevated in the olfactory tuberculum at this time point. At 18 h post-exposure, increased expression of HO-1 and COX-2 was observed in cerebral cortex and cerebellum, respectively. Induction of HO-1 protein was not observed after DEE exposure. Bronchoalveolar lavage analysis of inflammatory cell influx, TNF-α, and IL-6 indicated that the mRNA expression changes occurred in the absence of lung inflammation. Our study shows that a single, short-term inhalation exposure to DEE triggers region-specific gene expression changes in rat brain to an extent comparable to those observed in the lung

Getting into the right lane for low-carbon transport in the EU

This paper focuses on the vision of and the pathways towards low-carbon transport systems in the EU. Three interrelated themes are examined. It refers to a report of The Netherlands Environmental Assessment Agency and Stockholm Resilience Centre titled Getting into the Right Lane for 2050, which includes three themes. The first theme is land resources, including water, and the EU’s role in a world providing food for all without further loss of biodiversity. This implies improving agricultural productivity in order to close ‘yield gaps’ in all regions, containing biodiversity loss worldwide on the way to 2050. It also implies a strategy of diversity in EU land and agriculture policies. The second theme is energy and envisages a low-carbon energy system in the EU in 2050. This amounts to 80% decrease in domestic emissions of greenhouse gases by 2050 and connects with the EU’s need to improve energy security. The third theme is transport, with a vision for 2050 of low-carbon transport in Europe

Kwaliteit belangrijker dan tijdigheid : hoogwaardig OV in vinex wijken

Vroegtijdig aanleggen van hoogwaardig openbaar vervoer heeft slechts een tijdelijk eff ect op het ov-gebruik in Vinex-wijken, zo blijkt uit een onderzoek in drie grote Haagse nieuwbouwwijken. Het gebruik van de tram is wel hoger in wijken waar deze vroegtijdig is aangelegd, maar dat verschil in tramgebruik verdwijnt na een aantal jaren. De kwaliteit van de verbinding is voor reizigers veel meer een doorslaggevend argument om al dan niet het ov te nemen

Fiscal Policy and CO2 Emissions of New Passenger Cars in the EU

To what extent have national fiscal policies contributed to the decarbonisation of newly sold passenger cars? We construct a simple model that generates predictions regarding the effect of fiscal policies on average CO2 emissions of new cars, and then test the model empirically. Our empirical strategy combines a diverse series of data. First, we use a large database of vehicle-specific taxes in 15 EU countries over 2001-2010 to construct a measure for the vehicle registration and annual road tax levels, and separately, for the CO2 sensitivity of these taxes. We find that for many countries the fiscal policies have become more sensitive to CO2 emissions of new cars. We then use these constructed measures to estimate the effect of fiscal policies on the CO2 emissions of the new car fleet. The increased CO2-sensitivity of registration taxes have reduced the CO2 emission intensity of the average new car by 1,3 percent, partly through an induced increase of the share of diesel-fuelled cars by 6,5 percentage points. Higher fuel taxes lead to the purchase of more fuel efficient cars, but higher annual road taxes have no or an adverse effect