Occupational exposure to particulate matter from air pollution in the outdoor workplaces in Almaty during the cold season

English version

Autoři: Denis Vinnikov ^aff001; Zhangir Tulekov ^aff001; Aizhan Raushanova ^aff001
Působiště autorů: al-Farabi Kazakh National University, School of Public Health, Almaty, Kazakhstan ^aff001; National Research Tomsk State University, Tomsk, Russian Federation ^aff002; Peoples’ Friendship University of Russia (RUDN University), Moscow, Russian Federation ^aff003
Vyšlo v časopise: PLoS ONE 15(1)
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.pone.0227447

Souhrn

Background

A large fraction of population in Almaty and other Kazakhstan cities is employed in the outdoor jobs and likely exposed to high levels of particulate matter (PM) during the cold season. The magnitude of such occupational exposure remains unknown; therefore, the aim was to quantify the levels of exposure to PM₁₀ in the outdoor workplaces in Almaty in order to guide future interventions of primary prevention.

Methods

Outdoor security non-smoking guards (N = 12) wore TSI DustTrack AM520 aerosol monitors with a 10-μm impactor for 8 hours of outdoor shift. Ten samples (k = 10) from each worker were obtained for the cold season (November-March) from various locations across Almaty. Total sampling time was 57600 minutes. We compared normalized time-weighted average (TWA) concentrations for 8-hour shifts within and between workers using analysis of variance (ANOVA) and assessed compliance with environmental exposure limit (EEL) (0.060 mg/m³) via exceedance (γ) and probability of overexposure (θ).

Results

PM₁₀ TWA ranged from 0.050 to 2.075 mg/m³ with the geometric mean 0.366 and median 0.352 mg/m³. PM₁₀ TWA distribution was left-skewed with large variation. The fold-range of within-person variability, containing 95% of the exposure concentration (_wR_0.95) was 13, whereas between-person fold-range (_bR_0.95) was 3. However, between-person variance exceeded the one within with F-ratio 2.797 (p = 0.003) with statistical power 97% at α = 0.05. Only two of 120 samples had TWA below EEL, yielding γ = 0.995 and θ = 1.

Conclusions

Outdoor workers in polluted cities like Almaty are exposed to very high levels of PM₁₀ during the cold season. Urgent action should be taken to regulate such occupational exposure and to raise awareness of workers and employers on hazards associated with it.

Klíčová slova:

Public and occupational health – Employment – Pollution – Chronic obstructive pulmonary disease – Air pollution – Fossil fuels – Eels – Kazakhstan

Zdroje

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