Science & Environment | Spring 2019’s Worst U.S. Cities for Allergy Sufferers

North America
Africa
- Algeria
- Angola
- Benin
- Cabo Verde
- Cameroon
- Central African Republic
- Chad
- Congo
- Congo Democratic Republic
- Cote d'Ivoire
- Djibouti
- Egypt
- Equatorial Guinea
- Eswatini
- Ethiopia
- Gabon
- Gambia
- Ghana
- Guinea
- Guinea-Bissau
- Kenya
- Liberia
- Madagascar
- Malawi
- Mali
- Mauritius
- Morocco
- Mozambique
- Namibia
- Niger
- Reunion
- Rwanda
- United Kingdom
- Senegal
- Seychelles
- Sierra Leone
- South Africa
- Tanzania
- Togo
- Tunisia
- Uganda
- Zimbabwe
South America
- Argentina
- Brazil
- Chile
- Colombia
- Falkland Islands
- Guyana
- Paraguay
- Peru
- Suriname
- Trinidad and Tobago
- Uruguay
- Venezuela
Asia
- Armenia
- Azerbaijan
- Bahrain
- Bangladesh
- Bhutan
- Brunei
- Cambodia
- China
- Cyprus
- Georgia
- India
- Indonesia
- Iran
- Iraq
- Israel
- Japan
- Jordan
- Kuwait
- Kyrgyzstan
- Laos
- Lebanon
- Malaysia
- Mongolia
- Nepal
- North Korea
- Oman
- Pakistan
- Philippines
- Qatar
- Saudi Arabia
- Singapore
- South Korea
- Sri Lanka
- Syria
- Taiwan
- Tajikistan
- Thailand
- Turkey
- Turkmenistan
- United Arab Emirates
- Uzbekistan
- Vietnam
Australia/Pacific
- Australia
- Cook Islands
- Fiji
- Kiribati
- Marshall Islands
- Micronesia
- New Zealand
- Niue
- Palau
- Papua New Guinea
- Samoa
- Solomon Islands
- Tonga
- Tuvalu
- Vanuatu
Europe
- Albania
- Austria
- Belarus
- Belgium
- Bosnia and Herzegovina
- Bulgaria
- Croatia
- Czechia
- Denmark
- Estonia
- Finland
- France
- Germany
- Gibraltar
- Greece
- Hungary
- Iceland
- Ireland
- Isle of Man
- Italy
- Kosovo
- Latvia
- Liechtenstein
- Lithuania
- Luxembourg
- Malta
- Moldova
- Monaco
- Montenegro
- Netherlands
- North Macedonia
- Norway
- Poland
- Portugal
- Romania
- Russia
- San Marino
- Serbia
- Slovakia
- Slovenia
- Spain
- Sweden
- Switzerland
- Ukraine
- Vatican City (Holy See)