Risk Assessment of Air Contaminants

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Risk Assessment of Air Contaminants
Risk Assessment of Air
Contaminants
Community Air Protection Program (AB 617)
Portside Steering Committee Meeting January 19, 2021

Evaluación de Riesgos de
Contaminantes del Aire
Programa de Protección del aire Comunitario (AB 617) Reunión del Comité Directivo
Portuario 19 de enero de 2021

H E AT H E R B O L S TA D, P H . D .
S TA F F TOX I C O L O G I S T | TOX I C Ó L O G A
O F F I C E O F E N V I R O N M E N TA L H E A LT H H A Z A R D A S S E S S M E N T | O F I C I N A D E E VA L U A C I Ó N D E R I E S G O S A
L A S A L U D A M B I E N TA L
C A L I F O R N I A E N V I R O N M E N TA L P R OT E C T I O N A G E N C Y | A G E N C I A D E P R OT E C C I Ó N A M B I E N TA L D E
CALIFORNIA
Risk Assessment of Air Contaminants
Outline                             Esquema
 Background: risk, toxicity, and    Antecedentes: riesgo, toxicidad, y
 exposure                            exposición
                                     Cómo OEHHA determina la toxicidad
 How OEHHA determines toxicity

                                     Factores que influyen la toxicidad
 Factors that influence toxicity

                                     Preocupaciones de salud asociadas con
 Health concerns associated with

 some air contaminants               algunos de los químicos que se miden
                                     ¿Cómo se determina el riesgo usando los
 How risk is determined from air

 monitoring data                     datos de monitoreo del aire?

                                                                          2
Risk Assessment of Air Contaminants
Toxicity                            Exposure
                                     x
 Risk =      Toxicidad                            Exposición
Riesgo
    How dangerous is the chemical?       Does chemical or enter our body?
         ¿Qué tan peligroso                      ¿El químico hace
           es el químico?                      contacto o entra en
                                                 nuestro cuerpo?

      Health Guidance Values                  Air monitoring data
            Valores de                             Datos de
       Orientación de Salud                   monitoreo del aire
Risk Assessment of Air Contaminants
What is Exposure? ¿Qué es la exposición?

                            https://commons.wikimedia.org/wiki/File:Diesel-smoke.jpg
                            https://www.sandiegouniontribune.com/business/la-fi-port-automation-maersk-
                            20190626-story.html
                            https://www.dreamstime.com/photos-images/san-diego-yard.html                  4
Risk Assessment of Air Contaminants
How do we determine        ¿Cómo determinamos la toxicidad
the toxicity of chemicals? de productos químicos?
 OEHHA develops benchmarks for          OEHHA desarrolla puntos de referencia para
 toxicity called Health Guidance        la toxicidad llamados Valores de Orientación
 Values:                                de Salud:
 Noncancer: Reference Exposure          No canceroso: Niveles de exposición de
 Levels (RELs)                          referencia (REL, por sus siglas en inglés)
   The amount of chemical in the air    La cantidad del químico en el aire que no es
   that is not likely to cause          probable que cause efectos a la salud no
   noncancer health effects (like       relacionados con el cáncer (como el asma)
   asthma) even in sensitive            incluso en poblaciones sensibles como niños
   populations like children and        y mujeres embarazadas
   pregnant women
                                        Cancer: Unidad de riesgos o factores de
 Cancer: Unit risks or cancer potency   potencia del cáncer
 factors
   Describe increase in cancer risk     Describir el aumento del riesgo de cáncer por
   per unit of exposure                 unidad de exposición
                                                    http://clipart-library.com/clipart/163895.htm 5
Risk Assessment of Air Contaminants
What influences                 ¿Qué influye en la
toxicity?                       toxicidad?
 •Amount
  Cantidad
 •Length of exposure (time)
  Duración de la exposición (tiempo)

 •Sensitivity
  Sensibilidad        https://www.meadindoor.com/for-physicians/
                                                                   6
Risk Assessment of Air Contaminants
Health effects can become more serious as the
 amount someone is exposed to increases
  High/Alta
                                                                                                                             Muerte

                                                                                                Respiracion Trabajosa
                                                                              Inconsciente

Seriousness                                                      Sueño Profundo
of effect/
Seriedad de                                   Soñoliento/a
efecto
                                Mareado/a

  Low/Baja                Ningun Efecto

              Low/ Baja                     Amount of alcohol consumed                                          High/ Alto
                                            Cantidad de alcohol consumido

                     https://science.education.nih.gov/supplements/webversions/Chemicals/guide/lesson3-1.html                         7
Risk Assessment of Air Contaminants
Toxicity depends on the amount                                                              La toxicidad depende de la cantidad de
    of time someone is exposed to a                                                             tiempo que una persona esté expuesta a un
    chemical                                                                                    químico

     OEHHA develops Reference                                                                    OEHHA desarrolla niveles de
     Exposure Levels for specific                                                                exposición de referencia
     amounts of time                                                                             para cantidades específicas
    o Brief exposure (acute):                                                                    de tiempo
      occasional 1-hour exposures                                                               o Breve exposición (aguda):
    o Moderate exposure: repeated                                                                 exposiciones ocasionales de 1 hora
      8-hour exposures over a                                                                   o Exposición moderada : exposiciones
      significant fraction of a                                                                   repetidas de 8 horas durante una
      lifetime                                                                                    fracción significativa de la vida
    o Constant exposure (chronic):                                                              o Exposición constante (crónica):
      continuous exposures from 1                                                                 exposiciones continuas desde 1 año
      year to a lifetime                                                                          hasta toda la vida.
https://www.deere.com/en/mowers/lawn-tractors/x700-series/x758-lawn-tractor/; https://www.latimes.com/local/california/la-me-freeway-pollution-what-you-can-do-20171230-htmlstory.html
                                                                                                                                                                                         8
Risk Assessment of Air Contaminants
Toxicity depends on the amount                                                              La toxicidad depende de la cantidad de
    of time someone is exposed to a                                                             tiempo que una persona esté expuesta a un
    chemical                                                                                    químico
     Example: exposure to diesel exhaust                                                        Ejemplo: exposición a gases de escape diesel

                                                                                                  Acute: Mowing the lawn for 1 hour
                                                                                                  Agudo: Cortar el pasto por 1 hora

                                                                                                  Chronic: Living next to a freeway
                                                                                                  Cronico: Vivir al lado de una autopista

https://www.deere.com/en/mowers/lawn-tractors/x700-series/x758-lawn-tractor/; https://www.latimes.com/local/california/la-me-freeway-pollution-what-you-can-do-20171230-htmlstory.html
                                                                                                                                                                                         9
Risk Assessment of Air Contaminants
Particulate Matter (PM)                        Particulas de Materia (PM)

               https://www.epa.gov/pm-pollution/particulate-matter-pm-basics   10
Health Concerns: PM2.5
• Can reach deep into the lung
• Short-term exposure: ↑ respiratory irritation,
  asthma attacks, irregular heartbeat,
  respiratory symptoms, ↓ lung function
• Short- and long-term exposure: premature
  death, cardiovascular mortality and
  hospitalizations, respiratory and asthma
  hospitalizations, neurological outcomes
• Additional sensitive populations
  Elderly
  Infants/children (↑ respiratory illnesses, ↓ lung
   function)                                           https://www.masters.tw/wp-content/uploads/2015/07/pm2_52.jpg

  Pregnant women (↓ birth weight, preterm birth,
   stillbirth)                                                                                                        11
Diesel Exhaust Particulates        Partículas de escape diesel
                                        Currently no real-time instruments to directly
                                        measure them
                                        Black carbon (BC) is a major component that
                                         can be measured in real-time
                                       Therefore, BC is measured as a surrogate for
                                         diesel particulate matter (DPM)
                                       1 gram BC ≈ 1.3 gram DPM

                                        Actualmente no hay instrumentos en
                                        tiempo real para medirlos directamente
                                        El carbono negro (BC) es un componente
                                         importante que se puede medir en tiempo
                                         real
                                        Por lo tanto, BC se mide como un sustituto
                                        del material particulado diesel (DPM)
                                        1 gramo BC ≈ 1,3 gramos DPM

             Myung and Park 2012
                                                                                      12
Health Concerns: Diesel                      Preocupaciones de
Exhaust                                      salud: escape de diesel
Noncancer                                     No Canceroso
 Respiratory irritation, cough, allergies,      Irritación respiratoria, tos, alergias,
 lung inflammation                              inflamación de los pulmones
 ↑ hospitalizations, ER visits, asthma          ↑ Hospitalizaciones, visitas a
 attacks, premature deaths                      urgencias, ataques de asma,
 Sensitive populations                          muertes prematuras
   o Those with respiratory/cardiovascular      Poblaciones sensibles
     conditions                              o Aquellos con condiciones
   o Children                                 respiratorias y cardiovasculares
   o Elderly                                 oNiños
Cancer                                       oPersonas de tercera edad
                                              Cancer
 Increased cancer risk
                                              Aumento del riesgo de cáncer
 ~70% of average Californian’s cancer         ~70% del promedio de riesgo de
 risk from air pollution (CARB)
                                              cáncer en California debido a la            https://commons.wikimedia.org/wiki/File:Diesel-smoke.jpg

                                              contaminación del aire (CARB)

                                                                                                                                            13
Health Guidance Values for                                                     Valores orientativos de
Diesel Exhaust                                                                 salud para el escape diésel
 Non-cancer                                                                      No-canceroso
  Chronic REL: 5.0 μg/m3                                                           REL Cronico : 5.0 μg/m3
  Effect: Changes in structure of rat lung                                         Efecto: Cambios en pulmones de ratas
 Cancer                                                                          Cancer
  Unit risk: 0.0003 per μg/m3
                                                                                   Riesgo Unitario: 0.0003 por μg/m3
  Inhalation Cancer Potency Factor: 1.1 (mg/kg-day)-1
                                                                                   Factor de potencia del cancer de inhalacion: 1.1
  Effect: Lung tumors in workers
                                                                                   (mg/kg-day)-1
  1 in a million risk = 0.0033 μg/m3
                                                                                   Efecto: Tumores pulmonares en trabajadores
                                                                                   1 in a million risk = 0.0033 μg/m3

                    https://oehha.ca.gov/media/downloads/crnr/appendixb.pdf; https://oehha.ca.gov/media/downloads/air/document/partb.pdf   14
Similar Health Effects for Black Carbon (BC)
Noncancer                                    Cancer
Respiratory effects reported in BC workers   • Also listed as Prop 65 carcinogen
• Cough                                      • Lung cancer/tumors in BC production
• Sputum production                             workers and animals exposed in the
• Bronchitis                                    laboratory
• Chest radiographic opacities (e.g.         Sensitive populations
   pneumoconiosis)                             • Asthmatics had higher total deposition
• Decreased lung function                         of ultrafine carbon particles in the
Effects reported in rodent studies                respiratory tract than healthy
                                                  individuals
• Inflammation
                                               • Amount deposited in lungs can increase
• Lung epithelial cell injury
                                                  during exercise or heavy work
• Lung lesions
                                                                               IARC 2010   15
Reduced PM Exposures Improve Health Outcomes
• Central Valley - reduced residential wood burning (required by Rule 4901)
  decreased cardiovascular disease hospitalizations (Yap & Garcia, 2015)
• California - retirement of 8 coal and oil power plants reduced preterm births and
  increased fertility rates (Casey et al. 2018a,b)
• Utah Valley - Steel mill shutdown reduced PM10 and respiratory hospital admissions
  (Pope 1989)
• Ireland - Coal sale ban reduced PM and death from lung disease (Dockery et al.
  2013)
• So. California - Children who moved to less polluted areas had improved lung
  function growth; those who moved to more polluted areas had decreased lung
  function growth (Avol et al. 2001)
• 51 U.S. metro areas - PM reductions increased life expectancy (Pope et al. 2009)
• Reduced diesel PM expected to decrease cancer risk
                                                                                       16
How do we determine the risk from the amount of a
chemical measured in air?
     Noncancer                  No canceroso                    Cancer                           Cancer
How does the amount in air      ¿Cómo se compara la         How much does the            ¿Cuánto aumenta el riesgo
 compare to the Reference     cantidad en el aire con el   amount in air increase        de cáncer la cantidad en el
     Exposure Level?           nivel de exposición de         cancer risk by?                       aire?
                                     referencia?

      Higher? May be some concern                                Higher? Concern
      ¿Mayor? Puede ser alguna preocupación                      ¿Mayor? Preocupación

          Reference Exposure Level                              Risk target (insignificant cancer risk)
          Nivel de exposición de referencia                     Objetivo de riesgo (riesgo de cáncer insignificante)

                     Lower? Little concern                        Lower? Less concern
                     ¿Inferior? Poca preocupación                 ¿Inferior? Menos preocupación
                                                                                                                       17
Questions?            ¿Preguntas?
Heather Bolstad, Ph.D.
heather.bolstad@oehha.ca.gov

                                    18
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