Tashkent Air Quality Index (AQI)

Tashkent's air pollution comes from four main sources. First, coal and gas heating: winter temperatures drop to -15°C and coal heating dominates in older residential areas and industrial zones. District heating networks from the Soviet era still operate but are inefficient, and many areas supplement with coal or wood. Second, vehicles: an aging fleet of over 2 million registered vehicles in the Tashkent metro area, including many pre-Euro 3 cars and diesel minibuses (marshrutkas). Third, cotton burning: Uzbekistan is one of the world's top cotton producers, and October–November agricultural burning of cotton stalks creates regional smoke plumes that affect Tashkent. Fourth, Aral Sea dust: the desiccated Aral Sea lakebed, 500km to the northwest, releases salt and dust in storms that transport fine particles to Tashkent and across Central Asia.

The Aral Sea was once the world's fourth largest lake; it has lost 90% of its volume since the 1960s due to Soviet-era irrigation diversions for cotton farming. The exposed 50,000+ km² lakebed (the Aralkum Desert) is coated with salt, pesticide residues, and fine sediments. Dust storms from the Aralkum carry particles up to 2,000km, regularly reaching Tashkent (500km east). These dust events push PM10 to 200–500 µg/m³ and PM2.5 to 80–150 µg/m³ during major storms, typically in spring (March–May) and late summer (August–September). The dust contains harmful salts and chemical residues that cause elevated rates of respiratory disease, throat cancer, and anemia across Central Asia. A 2022 WHO study linked Aral Sea dust to increased pediatric respiratory disease in Uzbekistan.

The best months for air quality in Tashkent are May, June, and July. June is typically the cleanest month (AQI ~58). By June, the coal heating season has ended, spring dust storms have mostly passed, and summer air masses provide good atmospheric mixing. Temperatures are pleasant (28–35°C in June, 35–40°C in July). Avoid January–February (coal heating peak, AQI 135–148) and October–November (cotton burning + heating season start, AQI 88–138). Spring (March–April) can bring dust storms but is generally moderate. Summer is the overall best window for visitors concerned about air quality.

Tashkent is in the middle of Central Asian capital cities for air quality. Bishkek (Kyrgyzstan, AQI ~108) and Almaty (Kazakhstan, AQI ~98) are typically more polluted, largely due to their more severe valley-trap geographies and heavier coal heating dependence. Dushanbe (Tajikistan, AQI ~74) and Ashgabat (Turkmenistan, AQI ~68) are somewhat cleaner. Tashkent at AQI ~85 sits between these groups. None of Central Asia's capitals approaches the severity of South Asian polluted cities (Delhi AQI 168, Lahore AQI 176) or Ulaanbaatar (AQI 188).

Uzbekistan has launched several initiatives under President Mirziyoyev's modernization program. Vehicle emission standards were tightened with Euro 4 requirements from 2022. Uzbekistan's UzGas program is expanding natural gas connections to reduce coal and wood burning in households. The Tashkent metro (4 lines, 29 stations, electric) handles ~100 million passengers/year, significantly reducing vehicle trips. An electric bus program launched in 2022 is adding zero-emission vehicles. Cotton burning restrictions have been strengthened with fines, though enforcement varies. The government's 2030 Green Economy program includes air quality targets. Tashkent's air quality has measurably improved from the worst years of the 1990s–2000s due to these reforms, though annual AQI remains well above WHO guidelines.