diff --git a/README.md b/README.md
index 6f9efad..8e5f769 100644
--- a/README.md
+++ b/README.md
@@ -23,10 +23,14 @@ The schema is based on the core elements from [planningalerts.org.au](https://ww
 According to the principle of _one codebase, many deploys_, this scraper is [configured using environment variables](https://12factor.net/config) rather than by editing constants in the code.
 
 | Name | Purpose | Default | Required? |
-| --- |--- | --- |
+| --- | --- | --- |
 | MORPH_DELAY      | Minimum delay in seconds between HTTP requests to the server. | 10 | No |
 | MORPH_USER_AGENT | User agent string sent as an HTTP request header. | _None_ | Yes |
 | MORPH_LOG_LEVEL  | Controls the level of detail in the output logs according to [Ruby's `Logger` class](https://ruby-doc.org/stdlib-2.1.0/libdoc/logger/rdoc/Logger.html) constants. | 1 _(Logger::INFO)_ | No |
+| MORPH_DAYS | | Number of days to scrape | Only if MORPH_MONTHS is unset |
+| MORPH_MONTHS | Number of months to scrape | _None_ | Only if MORPH_DAYS is unset |
+| MORPH_STATUS | Only scrape applications with this status code. | _None_ | No |
+
 
 ## Running
 
diff --git a/scraper.rb b/scraper.rb
index 2c24d29..9c6f185 100644
--- a/scraper.rb
+++ b/scraper.rb
@@ -33,14 +33,34 @@ logger.info "Log level is: #{logger.level}"
 URL = SITE_URL + '/Northgate/PlanningExplorerAA/GeneralSearch.aspx'
 
 form_vars = {
-  # 'cboStatusCode' => '4', # REGISTERED
   'cboSelectDateValue' => 'DATE_RECEIVED',
-  # 'cboMonths' => '12', # 1..12
-  'cboDays' => 1,
-  'rbGroup' => 'rbDay',
   'csbtnSearch' => 'Search' # required
 }
 
+# If both MORPH_DAYS and MORPH_MONTHS are set, MORPH_DAYS should be used.
+
+unless ENV['MORPH_DAYS'] || ENV['MORPH_MONTHS']
+  logger.fatal "Neither MORPH_MONTHS nor MORPH_DAYS set. Nothing to scrape. Exiting."
+  exit 1
+end
+
+if ENV['MORPH_MONTHS']
+  form_vars.merge!({
+    'cboMonths' => ENV['MORPH_MONTHS'],
+    'rbGroup' => 'rbMonth'
+  })
+end
+
+if ENV['MORPH_DAYS']
+  form_vars.merge!({
+    'cboMonths' => nil,
+    'cboDays' => ENV['MORPH_DAYS'],
+    'rbGroup' => 'rbDay'
+  })
+end
+
+form_vars.merge!({ 'cboStatusCode' => ENV['MORPH_STATUS']}) if ENV['MORPH_STATUS']
+
 logger.info "Form variables: #{form_vars.to_s}"
 
 headers = {