Development of reduction scenarios for criteria air pollutants emission in Tehran Traffic Sector, Iran

Temporal variations of ambient air pollutants and meteorological influences on their concentrations in Tehran during 2012–2017

“…In summary, the main reasons behind the declining trend of annual PM 2.5 and SO 2 may be associated with various local air pollution control policies such as implementation of rules on emission standards and fuel quality enhancement (e.g. low sulfur diesel), phasing out of old/carburetor equipped vehicles, the mandatory use of diesel particulate filter, vehicle catalyst replacement, adopting EURO norms, conversion of diesel engines to compressed natural gas, as well as the extending public transportation, particularly subway and bus rapid transit 7,22,23 . As reported by Tehran Air Quality Control Company (TAQCC), during the period 2014-2017, the sulfur content of gasoline and diesel distributed in Tehran megacity was decreased from 200 and 7000 ppm to approximately 20 and less than 50 ppm, respectively 24 .…”

Study of particle number size distributions at Azadi terminal in Tehran, comparing high-traffic and no traffic area

“…The main reason for this is the fact that Tehran has a specific spatial traffic with more than 4 million vehicles that mainly are outdated. In fact, the air pollutant-related to traffic affect all districts of Tehran [ 30 ].…”

Occurrence, spatial distribution, seasonal variations, potential sources, and inhalation-based health risk assessment of organic/inorganic pollutants in ambient air of Tehran

“…Thus, Tehran is one of the most polluted cities in the world. As such, it has been receiving much attention from the Iranian central government, scientific organizations and centers, the general population, as well as national and international environmental researchers (Amini et al 2017;Taghizadeh et al 2019;Mohammadiha et al 2018). Tehran has spatiotemporal traffic conditions with over 17 million trips and approximately 7 million kilometers of traffic per day.…”

“…Tehran has spatiotemporal traffic conditions with over 17 million trips and approximately 7 million kilometers of traffic per day. In addition, daily consumption of gasoline, diesel, and compressed natural gas (CNG) in Tehran has been reported at about 11 and 3 million L as well as 2 million m 3 , respectively (Mohammadiha et al 2018;Shahbazi et al 2018). Meanwhile, numerous studies have been conducted on various topics of environmental air pollution in Tehran, including examination of chemical and toxicological properties of suspended particles (aerosol) (Arhami et al 2017), possible sources of air pollutants (Taghvaee et al 2018), and health effects associated with environmental air pollutants (Yousefian et al 2018).…”